Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3f6f0139115ab5f…

MALICIOUS

PDF

85.2 KB Created: 2021-09-02 20:06:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 73c69f00950b195ae9b02460855663f3 SHA-1: 66ee260743cd0fcf2e5f08ece5095b3ad48716c7 SHA-256: d3f6f0139115ab5fb38cfdab88f034992adf8e4f590c7eac54517d2e9e285c0e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm for SEO manipulation or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic point to a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://evola.it/userfiles/files/33548620213.pdf In PDF document text
    • http://timebymtm.com/upload/files/mobusuta.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/90180429965.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/nefesomafidiliwepabezuxoz.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/49924721600.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/88967220135.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/zusosunubezab.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/mnhe49fg2o20rhvclsaagcd1n2/78589034216.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cc4a0042314---mafepeg.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/12240740391.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/dimoxolavur.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/45454549747.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/wefemufanalifaruletopudu.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/bepopabanuk.pdfIn PDF document text
    • https://corghialberti.it/file/wigifanabumoropixex.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/53406882994.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608827cb012f1---zemezipolamojekar.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/jutazusadiwovadomojin.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/91679295111.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608894a05e922---91929580754.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075925f442d3---buwedixofifojej.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/nubexozaputikidamis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=rabindranath+tagore+biography+in+bengali+pdf+downloadPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/629718e0257398c32006f814e659a1df/puzaga.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_off0000e1ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AB 10992 bytes
SHA-256: 7675e378a05437215649bc8408c024ff5f638e687b0308be476662afc7618f3e
font_01_sfnt_off0000fabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABB 19928 bytes
SHA-256: a398b15ca46da0995982650b68417fd896fdd7c361586e72cfd55d984fc14355
font_02_sfnt_off00012ec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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