Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f9354760ce1b0b4…

MALICIOUS

PDF

81.3 KB Created: 2021-09-17 00:41:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 791acce198a6ef14f129c368d03b92dc SHA-1: 05bd5c181b6f09508b37ec7612dd9701232dccd6 SHA-256: 2f9354760ce1b0b4ab96a8d210ef777b8b4b0181b3c64151f8d49a5588a2e4c0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised or disposable domains, suggesting a link farm intended to redirect users to malicious sites. The 'SE_CALLBACK_LURE' heuristic indicates a potential phishing or tech-support scam context, further supported by the ML classifier's high confidence in maliciousness. No scripts were extracted, but the presence of multiple external URLs points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cructi.ru/uplcv?utm_term=ftl+for+android PDF link annotation
    • http://sparan-art.ru/ckfinder/userfiles/files/74827612306.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/taberanesoza.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/42568454042.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/5175122058.pdfIn PDF document text
    • https://mitrasuksesku.com/userfiles/file/nivewadomudidixisovelubob.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/loxomasamim.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/samibimop.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/b81565ad1e6ad3819d4bdb254af5ffec/3722168391.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/50715457858.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410ee8e8dc3---losugir.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134dce94235d---zakegafubofadebewode.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/sekikoxedapixakagaxitul.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/a59905c70c5e22930868ad5257c9a2d6/3820484634.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/sebimoremosujiten.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/wixonusilopadojevulikov.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/44237064331.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/88943362257.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/refidu.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/18317926363.pdfIn PDF document text
    • http://boki.hu/editor_up/4866796213.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ed2269c94---87666412682.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/fikazab.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/dotumibidulemegodevi.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136aa3f624c3---45533661995.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_off0000db41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB41 17732 bytes
SHA-256: 2874206ea7303d18ca451230c938cb4df3fc89c4b61e386a8ac1798bc3578c5c
font_01_sfnt_off00010974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10974 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001218b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218B 10024 bytes
SHA-256: 9f357610e53d0c93363bc0ac29982ba2dcab0433db569996b7e99ed706fcdc97

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