Malicious PDF — malware analysis report

Static analysis result for SHA-256 63f68860ab3afd36…

MALICIOUS

PDF

75.0 KB Created: 2021-09-03 21:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1db8f30a9067b57c0fa7d30e5615237e SHA-1: cd9b3d6c1a969c8084c937839bbf79d44f04ac4c SHA-256: 63f68860ab3afd3693f744035f705d16b4b1dc8903e90c4b1312852e67391d2d
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. Heuristics indicate it functions as an MFA or callback lure, designed to trick users into providing credentials or initiating a fraudulent transaction. The embedded URLs point to compromised WordPress sites, suggesting a distribution infrastructure for phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://catamma.ru/uplcv?utm_term=skytech+remote+manual+1001-a PDF link annotation
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826618db3e9---19872382794.pdfIn PDF document text
    • http://caigeshi.com/uploadfile/file/2021071712003873499.pdfIn PDF document text
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/66249218082.pdfIn PDF document text
    • http://hersheyhigh1981.com/clients/37302/File/wubimeberobibuj.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/9523647029.pdfIn PDF document text
    • http://wamer.org/userfiles/file/gemozuzarepepurifobewiwek.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/dazajesufobidumimafaw.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/8552d9e618988d85820da7b970feee6b/58164988985.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862e79df43b---46814930505.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/82121298726.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/86482365896.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/nupatomarigadimexiwewo.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/lebuwuribanap.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16119f4f46d467---2551531876.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/tusupataledov.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/wewodama.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160955c7fcf44a---94706139772.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/qid40ru08634qf2c559upn1c28/50840142872.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16094f2774f5ed---mazodakotegibiniwaruvorew.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161131e0109986---9098094773.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/bumuzaki.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610f701153edb---29382858551.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_off0000c178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC178 17044 bytes
SHA-256: d4222f87f0c1772b00b937e820286bb5fef5c8ad8cc9136ba93d9fc19be3e475
font_01_sfnt_off0000ed70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10587 10824 bytes
SHA-256: 44ad67f494b624bc5eafbe751eab966df022d4bb8909da1c0c4434d84f8cd43c

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