Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a0eba36bf05ae65…

MALICIOUS

PDF

85.2 KB Created: 2021-07-08 07:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2e485e12ec98ff964a9936109024939e SHA-1: a84ce3c0941cf781e062514f4ba893800da3b67e SHA-256: 5a0eba36bf05ae6579ef23502def03328ffb4979bcd6b7d5d549b65c133b3ae4
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This structure suggests a multi-stage attack, likely for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6eedc8d6f8---22713685876.pdf In PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/69756c54c320c31bd0badf40f74891b5/3551420150.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/uajt6spsb0tm6v8gid5m9c95f3/rikewa.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ee66cd203---bemupufewije.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/jekavud.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/gumojonemolufisikamesetit.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d19d9f1fe1b---35530345311.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753ad8b8f30---73654828979.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hri1gf9rb7q2vfdq9tkh5tuc65/30207418955.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/610bff0c7fc78affd8c97a0e0e5a1b95/51082607436.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/92dc0f1bb08ca5a4e690d8eadc35cace/58698549402.pdfIn PDF document text
    • https://ocbond.org/userfiles/files/50461065514.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/fafinipifadeloboxafitukeb.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/rd07037dg932mef2kc3fnhrhu3/xifenanuvunalopizipo.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/momuxuxulo.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/d661fa8cc323b652a9b40eee329ac2a8/saxaseji.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/76471461240.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/14287686209.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/bufozod.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc7cd4dfe9---bovelun.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79c64c7047---robibijamarina.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/384e8f1e20341f397098bc6d8cde8fe3/dixud.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/zarotaxanovun.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d3fa27a4d---4313644781.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/97722959598.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/c22c89b9236846eb16346cb8e8cfa1f2/78211879233.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=use+hunt+in+a+sentencePDF link annotation
    • 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_off0000ec5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5B 16568 bytes
SHA-256: 5b130ba2985d810fca671ad380173fd3e9157150b4ce55d34bf38bce3c126367
font_01_sfnt_off0001175c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F73 10168 bytes
SHA-256: 55a9280d45026edba93604ede9007ee4e27df91d43dd244777db9938576aab4a