Malicious PDF — malware analysis report

Static analysis result for SHA-256 25dfa18e2bf1723f…

MALICIOUS

PDF

100.2 KB Created: 2021-08-22 03:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 461e934094c7bb1bfd54f6fc05d05a44 SHA-1: 6d00be53be1ba18de5bd1635ac6fdeb0b9bcb4c4 SHA-256: 25dfa18e2bf1723f57fbf82a355af622e4c01ef25ba59093c49809a464d2a0bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to numerous external URLs hosted on compromised CMS uploads and disposable domains. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • 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.
  • 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=how+to+fix+paslode+framing+nailer PDF link annotation
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/23aac8e8e218b15193439a9aa5d58279/27125419171.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd7b959dd0---muzubesadedovugurilipumu.pdfIn PDF document text
    • https://activepymes.com/pub/file/tuxuxebuduru.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/85666047576.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/63959054211.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/34873132245.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/2af1f97faf0c1e853a3ed386168bf9bc/86096922679.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/poxuzaxugaviw.pdfIn PDF document text
    • http://grapevinewinerytrail.com/clients/876125/File/13884912267.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608413d2b2bec---mezutuvotagi.pdfIn PDF document text
    • https://carlojans.com/cms/file/sefikolew.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073027c2001d---bugigewenisexemowefixo.pdfIn PDF document text
    • https://eubeer.vn/uploads/files/boruze.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/6ddfd98bdddfdfe20ed0219ecc4bbe64/78829172772.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee663a75c7---15433723469.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9a52e8789---34777043238.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/95286032943.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/tadirexenev.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/juvid.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/kezarabani.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/040d4d1a89451186967b2a2f88c12cf0/79464768014.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/76fgbvgq6kuqh1dgpi64fro7d1/34341683741.pdfIn PDF document text
    • https://chp-travel.ir/data/file/roxezun.pdfIn PDF document text
    • http://soupworld.de/upload/file/verujubo.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/mejeli.pdfIn PDF document text
    • https://www.builderdepot.co.uk/paslode-im360xi-gas-framing-nailer-first-fix?___store=dIn 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_off0001236c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1236C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B7E 17540 bytes
SHA-256: ffc26e0ef11d916c927409b4dc5291b67501bcfd249bb94d7e2d9e1006ff5391
font_02_sfnt_off00016949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16949 11020 bytes
SHA-256: 480925f4d9cd1cfdd0b2583200bcf5d70430b60bf0782e7065aa0d516843b372

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