Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a165972e25d50a1…

MALICIOUS

PDF

77.7 KB Created: 2021-07-16 16:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a20b5d193fccc152a450bd8a589fccaa SHA-1: fbd323d625fbf2aa7853f210f3716181f1333212 SHA-256: 2a165972e25d50a1ba1eade07bd5e16589c6e5c354de787a73938d6292bd3374
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to multiple URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the heuristic findings clearly point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://emaaravm.net/upload/files/savozudasibemugadi.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16083b37dd74d7---sumelunezituruwitasamuxej.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074378363676---31054491103.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/82b260c41c7a7b06a22710bb9045397a/nisuxotigusetorofosu.pdf
    • http://gpkoaee.ru/ckfinder/userfiles/files/88844376458.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/lspisagh2luo5gvm3lvv1a16ag/xenaji.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/30f54020d77050c2588981e2ef6a79af/42864645097.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d40ad1572a4---wutoguvaxiteviwejaw.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609032c2a6e24---vinuzo.pdf
    • http://broorybulldogs.com/clients/33993/File/24697312113.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0dc2b89b9c---83968243953.pdf
    • http://agendatourvietnam.com/hinhanh/file/71156331876.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/acbd480ea8af663870f6d615fec78389/xepilaverutabojivesexisez.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160abf6efed913---65797680001.pdf
    • http://lab4050.com/upload/editor/file/33225759287.pdf
    • http://pnmanagementsolutions.in/uploads/jegirenerikipefog.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/4400563753.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea2b983bf9---bakakigerazonojunavu.pdf
    • http://salkim.com/userfiles/file/99772846441.pdf
    • https://x-software.cz/data/file/64613528087.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac3e32fc09---85818958203.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/4e008b7f24ccc5825271daadb100ddc6/zewozevepelolofe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=stay+with+me+chanyeol+piano+notes
    • 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_off0000cad6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD6 16792 bytes
font_01_sfnt_off0000e2e8.bin
2dcb59f526c78072b9540244fc3df045a84753976f54c593f866bbad868133c5
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E8 18172 bytes
font_02_sfnt_off000110fb.bin
528bcca156209d38cb14daf6f0e2f63b8880b8593ce5c0afed3bc7b9e05e94c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x110FB 10812 bytes