Malicious PDF — malware analysis report

Static analysis result for SHA-256 92b5e4d3f70db5ae…

MALICIOUS

PDF

75.3 KB Created: 2021-09-05 09:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8e9b50be329da4f73cd2237d73f394c4 SHA-1: 5b729121dc2edd4ec9f1697effd2c8cb3bdb5e62 SHA-256: 92b5e4d3f70db5aeb7f9a7d28e837e18f007165c9a3fbdcce809ab8672907ff5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The 'SE_CALLBACK_LURE' heuristic indicates the document may also attempt to trick users into calling a phone number, consistent with phishing or scam tactics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nomylo.ru/uplcv?utm_term=interior+professional+practice+pdf PDF link annotation
    • http://cungcapbaoduongcuanhatban.com/upload/files/87325741613.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2201718590---mopavonilezubokili.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/22639399055.pdfIn PDF document text
    • http://nhs-carpediem.com/clients/46367/File/5714605842.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c9dc3968fdc---siwajopiwoz.pdfIn PDF document text
    • https://fultoys.com/userfiles/63977386620.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1620411493.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/47205119974.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71567548999.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/39902907784.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/97564689287.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129e0141371d---99289244180.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/d06b5a4dfc16ab603adb16f9b38e764e/bowafinudoguvewegekax.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42777592832.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/14404452092.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/tuvazetokizerugibonipep.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/15226488870.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/sakutuwe.pdfIn PDF document text
    • http://amtutoring.com/clients/865321/File/nizudafoze.pdfIn PDF document text
    • http://chicohigh1987.com/clients/47015/File/tufobitexipujopugizuzel.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/74513530964.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/51947497522.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_off0000c2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC2 10564 bytes
SHA-256: f787a834f578a6897677049add42855940702ba0ef6e980b37fc6ef2236b83e5
font_02_sfnt_off0000f2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F2 17240 bytes
SHA-256: d47b5224a43f2b568b26d9d4b769d4c8c0bb74acd8faace087236698ee0bb4d8

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