Malicious PDF — malware analysis report

Static analysis result for SHA-256 537864501ede31e9…

MALICIOUS

PDF

89.6 KB Created: 2021-07-08 07:22:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 891249f9c7842d905c0c48943f89ce95 SHA-1: 39d22395c48b9bf2d3df04d965f10ad6defb4f98 SHA-256: 537864501ede31e9874712193b52d5cf46fcd23aef1ada0e4e2d4e11fbe4cead
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 sites and other disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a likely phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://avigailpekelman.com/sites/default/files/file/3814098121.pdf
    • http://poltinik.ru/userfiles/file/fasalokosanibatafeka.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/d6sarmg87qnqh4il0k0hf8chr4/97461962639.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4694b5f0eb---netijebimafamakuma.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd35fa29c36---zesobefenajuxemixexi.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/2c4f1234199be783003d09b952c714c7/tinuwupuzubipiton.pdf
    • http://dokumsuzgec.com/userfiles/files/gixaz.pdf
    • http://jiangsutravel.kr/userfiles/files/20210606_052851.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1fa36607a---95031457240.pdf
    • https://smsenerji.com/resimler/files/30572778882.pdf
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/ruvomelunebisodegepuneg.pdf
    • http://bowenworktimmins.com/clients/e/ed/ed750a77e36579213b976c45729ba45c/File/30621549273.pdf
    • http://thedewakohchang.com/image/upload/File/ubefatovilidavupevi.pdf
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5d1e087f9---sojobebolufejosivasojopop.pdf
    • http://skipjackpoke.com/ckfinder/userfiles/files/1162538248.pdf
    • http://landmanenterprises.com/clients/6/66/660ad4be7ac834282af30b44844c6003/File/kumixisodejakutogafurow.pdf
    • https://its-bulgaria.bg/files/file/96816088531.pdf
    • https://semagro-msw.ru/pics/images/file/gogiravosakegoretugap.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c671fe4166d---xibexasobemuga.pdf
    • http://kuresi-kaitori.com/upload/content_pic/files/fizuneg.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1609c46e0a4f04---53232933317.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=advantages+of+using+plastic+bags
    • 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_off0000fcdd.bin
4c1eb1296ec8b699211f5b1388559448eb4262d9145ed49796a8b62346b8fad6
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDD 16100 bytes
font_01_sfnt_off0001266d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1266D 16792 bytes
font_02_sfnt_off00013e84.bin
2d4264fc6a38921089dc1209b4052b511e50c3654933c0083eee5943f46fcd0b
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E84 10980 bytes