Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e82ad34bbadee17…

MALICIOUS

PDF

78.5 KB Created: 2021-08-13 12:56:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7e73238ab739d6767435113f5c843b48 SHA-1: 6f2baffb2716426693ba26413da6675f651bacb1 SHA-256: 8e82ad34bbadee17e584328796695b0365ff9b35bf40888dbf1b2b0f5e46f105
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed for SEO poisoning or phishing. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malware droppers or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://queure.ru/uplcv?utm_term=discografia+fito+y+fitipaldis+descargar+gratis PDF link annotation
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ra07j619uvug9q4f9u9b875d7q/wetegimevunubapimod.pdfIn PDF document text
    • http://babamoleskine.com/files/file/rogosogurozabisirabitaza.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/dufir.pdfIn PDF document text
    • http://novehorizonty.sk/userfiles/file/87953775695.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-7-27/20210727231020682553.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b4c38c8f4---pigugupakubenopozitej.pdfIn PDF document text
    • http://dogable.de/userfiles/file/sikaxibakol.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/e88ef892ccf371057ea414fc8b312dbb/36605549904.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/perulosofovomofasilixini.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/9047f6c1859223702c5997ea8ee4afa6/14721296439.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210607000042.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/votipotidotijido.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/9cdd49e7f8e31f0420aec3542814daf8/lasulifo.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/6c3c149bd3f11558bd14548afcb29a49/48182631274.pdfIn PDF document text
    • http://burrburroughsfamily.com/clients/55468/File/patumavilukemutidat.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/17076206042.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/doboriravuxomonefami.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3b8c3064b1---80691023464.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4bbea7b69---kokovaxunodobofunigem.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd922465e8---28410002503.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/16717336141.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/simun.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/a28n3vds7biegn6re0rnsgc8ue/ganikedopivun.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/37893084668.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16099eb2121e50---37343692283.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_off0000cbe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FF 10804 bytes
SHA-256: a847da46a963a9200b142f9cb1029a7da5dfc6d9999fb4b92fbd569c0ea01a86
font_02_sfnt_off0000fcde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDE 18664 bytes
SHA-256: 87bab79e9d559829d75bb1e7d59d400b4acdd4b43e5d8c8a731e3099a8752e9f

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