Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3658502d571e27b…

MALICIOUS

PDF

89.7 KB Created: 2021-07-07 13:30:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d4d76e386888861b41804a0d51da5055 SHA-1: 63ee0e16e7119f2d1f02a7ad36c494d1d8b0fa2c SHA-256: c3658502d571e27bec29784c8d898e02253fd9cf383975472beddec795a06599
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing lure, potentially leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://nutronicltd.com/userfiles/file/77308358003.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16088448a620fe---89935572965.pdf
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072dc51c3fe5---33659336100.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/5jr1hidht56m5oa84qlhcgbno4/86787462188.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076b3f397c20---86706192246.pdf
    • http://au-zlato.sk/upload/files/tipazipijawamo.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160820abaa3559---pivov.pdf
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/l6in1vu40ptcm13tvvue7csnu2/15279294126.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/1e4f5bc04a70f8b1741a6ef697977cfe/79490490550.pdf
    • http://adance0112.com/upfile/editor/file/morarizaf.pdf
    • http://0vote.com/ckfinder/files/nipomazizogadeputoreru.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/0b69b7fef52e145d41b212e2cef749e6/saxigiburoj.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/c87c5db6723729b20b22a2694cae9c85/kagoxepagoxeto.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/9f86ee713e71f155163feb2fd8802d9d/sojemoreligoziwuxinirowab.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/24pufqaisl34keiukk6hb2345k/nitinaxopu.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/0v7pdkcumr033sqfs4fjf0ifl6/fimisu.pdf
    • http://shopsuathientu.com/uploads/userfiles/file/zuzun.pdf
    • http://eotp.info/sites/default/files/fck/file/nibobopozupanuretel.pdf
    • https://footballsod.com/images/ck-uploads/files/12628766408.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d36b9d39e01---41255871344.pdf
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e822228fa---14269208308.pdf
    • http://greenmodels.ru/uploads/files/mepoxibalexipisigotuliwe.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78a68bc1db---58349098742.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=stree+full+movie+watch+online+dailymotion
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e027.bin
19c4c6fc9612322e19f9f8c8d46bb174aa8fb6d4c37214471adf4fc6299ac897
pdf-font-stream PDF embedded font (sfnt) at offset 0xE027 17740 bytes
font_01_sfnt_off00010eba.bin
4b430873c1355c07a7b6fc2a85d497e3939b341190f8238bfefd207250e34e94
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBA 16516 bytes
font_02_sfnt_off00012587.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12587 16792 bytes
font_03_sfnt_off00013d9e.bin
76f2b59d43af9657f2bd22dc2d4ef627e143e50fd011bc48a2bab59eef796aca
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D9E 11016 bytes