Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4ffa90286e06eda…

MALICIOUS

PDF

150.0 KB Created: 2021-08-09 04:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 16a3bb3e03f55afee5461c1bbcf66172 SHA-1: 5c0b39606bec1a30907fdcdc8bee42f1c4d767dc SHA-256: f4ffa90286e06eda8da4f4e4337bb761efc392b3b5a3c883d4a10a36e9fb6e6a
256 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials T1140 Deobfuscate/Decode Files or Information

This PDF document exhibits multiple indicators of malicious intent, including ML classification, a lure for clipboard command execution, and a lure for MFA/one-time-code harvesting, suggesting a phishing or credential harvesting campaign. The presence of numerous external URLs hosted on compromised CMS platforms indicates a likely distribution network for malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it is designed to trick users into executing commands or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://laborke.ru/uplcv?utm_term=is+the+fbi+fitness+test+hard PDF link annotation
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d055b1acf0---mubifemijomek.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/35d1c2f86dbc69412af27a237e3575b3/83606231116.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f9562d059d9---55486018264.pdfIn PDF document text
    • http://dallassymphonyleague.com/clients/1/14/14bb4a025281f1a32078cb68571f7cf3/File/zadoxopufenoxakarujeniwa.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/f973662b1e12b75f51baeb5296a6e293/babekebujema.pdfIn PDF document text
    • http://ruoumoc.com/upload/files/xukigepewuresogedikiponi.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/0670a56c4ff71dd380127fb069970db4/5401138790.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/26934941405.pdfIn PDF document text
    • http://sdds.be/userfiles/file/7000971200.pdfIn PDF document text
    • https://aashianarealty.com/file/kapodunududamijex.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160978a258f2d9---92801713652.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/14445148231.pdfIn PDF document text
    • https://highrise.pl/file/minofo.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/fa81c5193eddb73b12589357ebd72203/xaves.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/54a8f1e86cc7181786fda46291733c46/xamar.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083ae46d967e---41871452994.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/c4e55d87c76c26243fcb849ebf646fe0/dotujifujekagoxud.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5e1eef05e---61178472553.pdfIn PDF document text
    • http://ks-puyuma.com/CKEdit/upload/files/9733992640.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/95639126784.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/7043d3d35761493a37f536ebc5e5d535/radusopa.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/livorafazezefireparo.pdfIn PDF document text
    • http://belst.by/upload/file/tinatugovugesop.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/1195e3ede7ab31fe6dd6374838468c6a/62895627776.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/tevera.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ebf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EBF5 10376 bytes
SHA-256: f0a753b7b690be9ad16aebeae9459e3b232758398290a5762825bb8ecc0a3284
font_01_sfnt_off00020359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20359 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00021b6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21B6B 17356 bytes
SHA-256: 1d73761996b2cf40d506fad36550f003455e34f7fec18f758ef4c9d28ee5e63f

Open this report in the interactive analyzer, or submit your own file for analysis.