Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e2622fcbf992b66…

MALICIOUS

PDF

97.0 KB Created: 2021-07-02 04:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 4d6307ff7c545b8ad125e191a741bbf6 SHA-1: d87595f440689dc08fbe8c4b81f0bf3e47496efb SHA-256: 1e2622fcbf992b660605805f3ceaabf8c65da82fa790fcce7ff099291b529b6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the 'compromised CMS upload link farm' heuristic point towards an attempt to leverage these compromised sites for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

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://laborke.ru/uplcv?utm_term=definition+of+vowel+and+consonant+in+english PDF link annotation
    • http://araonline.hu/uploads/file/26691137297.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bec38a8bc90---47324468179.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609874f20d670---jasiwiv.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a82ae9182---75590604346.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f313f0c75---gizugumupavorawidigubokij.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/66317858810.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/xujomopeveselarodew.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e9568f997---xinopizuzilenag.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609088ef74de6---11223419162.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/donuruluzozoragetuji.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/xanaxaworizafe.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/30fa4ee3a189db04bcdf49d81cff3e1b/70151152349.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c18f23847f4---bejemelonipirafagoba.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cc29150f29b---wowilimusasanozuwomenado.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1fa515a81---fipazokotiwukusogipolijes.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/4e2e7bdcfa023a6a896f8c7ad48e3258/nifidamirapufedifezo.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2637069c78---17819264851.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/74f097a70d5f6e9c8ca223fac40c96ae/43025801088.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609490888400a---71282426825.pdfIn PDF document text
    • http://ajansnigde.com/resimler/files/97207908374.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/0a1165142b685f79bcd60e2ab850d87b/25922325915.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/vegizikepabovur.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609886a9d0fb7---55420830186.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10953 10808 bytes
SHA-256: 12d23e29ff4a924db9df7314b03cb3d3c7d9cf521c335e3f767ce61408d9b420
font_01_sfnt_off00012200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12200 1764 bytes
SHA-256: c87d3a154f68f2fa52936197df01f58012fb70c9f4278c9885a470afe52d69a0
font_02_sfnt_off00012a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14269 19776 bytes
SHA-256: 12370d41cd4f8a03971c4b70d10a59766511158d16956ff9308706bab861807a

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