Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c9bcc0ce0d92ae5…

MALICIOUS

PDF

85.3 KB Created: 2021-08-18 20:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d6dc00490a87c7fced996d42d94b8a1d SHA-1: b064ce40c95e9196ddf7e82e10af6507d41a956d SHA-256: 8c9bcc0ce0d92ae56614a8baa280d1ca5ad215c8fb390bb92b15d451fe765966
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. Heuristics indicate it is a payment redirection lure, a common tactic in business email compromise attacks. The document also contains a link farm pointing to multiple disposable hosting sites, likely to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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 http://happinessgown.com/upload/users/files/laxedonokaguzetakopux.pdf In PDF document text
    • http://mosjob.ru/images/file/legeba.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608427c0c1798---45491006376.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/eaf1bad6c8ce46e5cd8b23157975354c/90261784852.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5f214f27f---2602568725.pdfIn PDF document text
    • http://natproperty.com/userfiles/files/gifapugepujidewoxat.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/191f3330379e3c321d194ffe102b2a6e/rigaguganutakukomoxalate.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ad18ebece13---fiburufuvujuzoz.pdfIn PDF document text
    • https://fobh.net/userfiles/files/zopusebanonolam.pdfIn PDF document text
    • http://lecieldesandes.fr/ckfinder/userfiles/files/37863364095.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/goxuwerojekigizizu.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/2299005776.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210817065811.pdfIn PDF document text
    • http://aimic.com/userfiles/file/pegakuba.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210606084555.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160740ce0ae4ab---8666044285.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/jemejerudalugojumu.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f75c27f11a---manobobazonukoxeb.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/7630683595.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/7efa0f8c2a4810933bd1630c953925a2/kixit.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/5411606502.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/6bfe48075d549a4d210f8021d9dfc121/10474758849.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1611c4f935dc62---tirerewusibadu.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/88719422877.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/2e84b8fb73f409864888b27fb98b77c8/52807898159.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=receiving+wire+transfer+wells+fargo+routing+numberPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD571 15976 bytes
SHA-256: 629950758bda5ccb8a42ace8595408e085260b9fdad39986123a1646fd0fa248
font_01_sfnt_off0000fe7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7F 16232 bytes
SHA-256: bf3ac2bbc5511ca59b022801f68684aa2b8ae7661b1a55c6866fed5ae8d27d0d
font_02_sfnt_off00011461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11461 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012c78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C78 11116 bytes
SHA-256: 82d1ce53ff35b5878b8016105b09637dc8a1ff5cb15e67fdb4c5dd9d062b4f76

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