Malicious PDF — malware analysis report

Static analysis result for SHA-256 662a7f87bdcb82bf…

MALICIOUS

PDF

72.0 KB Created: 2021-06-27 10:35:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 45bd4c82dae9ef3330d0d7ac0ff89fdc SHA-1: 252d11b887a4b0b32b2e3ed58c22272dd532a967 SHA-256: 662a7f87bdcb82bfc673258bbd1f57902f11011ed208d31dce42eab9d0b749ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting it's used to distribute or redirect to malicious content. The presence of numerous external URLs indicates an attempt to lead the user away from the document to a potentially harmful site.

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://rajskiewakacje.pl/userfiles/file/87223623571.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/b37fdnqvo0ui6l83csphfats7h/mufowawuzokamizisoluraj.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/f44fe1f3375fc1ebd1f0b8a75c824526/vanifatapake.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d53c84db9---zefawafusoperetogadedel.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/de75e4d530cfdfa00375a01b8b09baae/bopup.pdf
    • https://betibg.eu/webroot/img/files/dipixoma.pdf
    • http://smcertificationservices.com/userfiles/files/losaledadud.pdf
    • http://ahlhy.com/uploads/file/111820323375.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/ed0fce4a14b191ffdfcc2172940866ef/xuziditimakenazodo.pdf
    • https://foulardfotografando.it/file/jexulenibolidu.pdf
    • http://medicare-darmstadt.de/bilder/UserImages/file/83283657420.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac3b079fed---wonagesuj.pdf
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/fagigilovinanofalevumew.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/3pd35n67h2mujquu23ubtqgv9e/wadaki.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/bae00ab7a2dc9acceac0971f9e467ca0/fosisevopajax.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160cccefb05169---39927356149.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/157ef8fc82f843d40052675ce6801d32/zebigafafomunesa.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7934c74df4---13903509393.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f79bde879---towovezop.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2c6a94e0d---42393420873.pdf
    • https://dadrarad.ro/userfiles/file/88963383644.pdf
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/mizebetug.pdf
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/imnc4bv9tp43b4rp089v8k3hi2/vokojigelezolupezujawex.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=microsoft+office+16+free+download+full+version+with+product+key
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b83a.bin
323f9476c55c1272788bef76243b7ebc2b73264f3b86b5a838dec88990743208
pdf-font-stream PDF embedded font (sfnt) at offset 0xB83A 11388 bytes
font_01_sfnt_off0000d337.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD337 16792 bytes
font_02_sfnt_off0000eb49.bin
567e7f2fc0b94a55e8d6ec729d1fbb34e032fca73be8228ce0ff4a089acaebca
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB49 15172 bytes