Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6b8b0727df81148…

MALICIOUS

PDF

87.7 KB Created: 2021-09-24 05:53:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3021573b5c8179b16710e445ad5d0baf SHA-1: 6426c28a92ee2e2ad30f39eb85eaa28064a2b705 SHA-256: a6b8b0727df811485870e2e0d84ce50f3870aa87eafb63ee1ad2df2ddb24da9a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. The document's structure and embedded URLs suggest it is part of a link farm designed to host malicious PDFs, likely for callback phishing or tech support scams. The presence of embedded URLs and the heuristic firings strongly suggest an attempt to redirect users to malicious content or solicit fraudulent calls.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://huntic.ru/uplcv?utm_term=devil+may+cry+android PDF link annotation
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c35cd66ad552e313ca154e95da0c5257/zejirikagomemasevano.pdfIn PDF document text
    • http://autodilygood.cz/files/file/duwipiruwudusiguxuvaxa.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/1041de8e11678403f34793abc334339c/dobuzepisafafikejexo.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/23913732014.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d41c8e7880---pawomuwowukifufesosutu.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa319a8ba0---64542368743.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/61285090501.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613a168b4d087---giwejozikowuf.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161444219638c0---27088195322.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/gagotutoxawawuxiku.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/fovumixu.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/80356583317.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/54827087508.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/6e3067020fbb305f0d1f89283673b5fe/tediwuzututopajifopopoj.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/10467823040.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/tadaruvetabiselogibon.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/49060959971.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/wutexo.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/96655373498.pdfIn PDF document text
    • http://top-caster.com/userfiles/file/juxaxopil.pdfIn PDF document text
    • http://balone.net/_upload/file///sobomiburiwebinikex.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/naxumajexaboxanipogexidin.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/25086318637.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_off0000e913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE913 10444 bytes
SHA-256: 8f10f12cef37926657524d14cc454e15c113049b512a56b20b8f184daa5e3618
font_01_sfnt_off000100b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CB 21500 bytes
SHA-256: 49f13be9638fb5906b96a7a4b0de2918c7443ec01e4c05e26e09c59e9fffe500

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