Malicious PDF — malware analysis report

Static analysis result for SHA-256 c77b24224386f1dd…

MALICIOUS

PDF

85.3 KB Created: 2021-07-13 22:23:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 87ece33b439b2a0ed55e43fa5278d586 SHA-1: 85ef3c9c1420840dc0614a25dfc1d795c34d4b7f SHA-256: c77b24224386f1ddeee74d7e011c6b6299ee2567ed86285ceef528bd8e29fdf5
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. The document contains numerous links, many hosted on compromised WordPress sites, which are likely intended to direct users to malicious content or phishing pages. The presence of a 'utm_term' parameter in one URL suggests an attempt to track user engagement with potentially deceptive content.

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 https://philabc.ru/uplcv?utm_term=dupage+county+circuit+court
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/icdic0p4op0qsklpsaipji6pe0/64873058091.pdf
    • http://www.cerathai.com/image/upload/File/65206541113.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e7uv30ps45r7kidqbbpluhtia7/77154809708.pdf
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a443cf7f4---22336421984.pdf
    • http://faulkfamilync.com/clients/c/cc/ccb94402b1eed20a0583117be0c0b506/File/pamasopabenuzurig.pdf
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/5oicg066k6nlof26agsmm1cro1/71308882029.pdf
    • https://calendarsunrooms.com/userfiles/files/47453592452.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606eae764a357---63593346718.pdf
    • http://www.truca-taoules.com//ckfinder/userfiles/files/98958969017.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/59od2q309ji5s20snf8dmld4kv/lubudevokukoverukoximike.pdf
    • http://www.sictombbi.fr/ckfinder/userfiles/files/kinokusi.pdf
    • http://mtsp.by/userfiles/files/nuzaxubumomez.pdf
    • http://farmaciafoglia.eu/userfiles/files/30303195524.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a99cc43686a---ziforido.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe66298f72---xilowasatoxajugumi.pdf
    • https://meganimal.pt/site/upload/file/85565644451.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/cub89viocvjch035dndbihddso/garijiwimiramulagifu.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/ed0331e68fc1fe637460d224cebc126a/74736696856.pdf
    • http://heninrealty.com/userfiles/files/xetatawupofeso.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/381436ca3c7e94b4da8cdfc46f8fef99/xogijenizedetibobedefu.pdf
    • http://xn--l3chcucnqd9c0eua7b1k.com/user_img/files/70263797580.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609831e2b69ad---rujupa.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/f4f148596998e9cc3400b4481a18e945/3797749421.pdf
    • 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_off0000e858.bin
75d7336d9d13b9205c079e89bf0778f5e7ccc60b90f52e29324e08091c011494
pdf-font-stream PDF embedded font (sfnt) at offset 0xE858 17824 bytes
font_01_sfnt_off000117bf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x117BF 16792 bytes
font_02_sfnt_off00012fd6.bin
cca20feed94068cbff0455abeee7ce5be409d1270e011c0642eb1e302afceea3
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD6 10548 bytes