Malicious PDF — malware analysis report

Static analysis result for SHA-256 029d210633a1ffe4…

MALICIOUS

PDF

80.9 KB Created: 2021-09-16 19:56:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f9af9115eb8a25b77743cd36d633bc23 SHA-1: 409534bd50a766a2ac1c3235cc10556eeeb45f48 SHA-256: 029d210633a1ffe45c373170830c1cea6a3f578b11de830a99932075c8c308de
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to multiple disposable hosting sites and compromised CMS uploads, suggesting an attempt to distribute malicious content or phish users. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sunnysolutions.it/uploads/assets/file/66360124252.pdf
    • http://himalayakebab.com/shipinc/userfiles/files/94565534197.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/66io5noe61jfa446qub6gq96va/72125583231.pdf
    • https://path.mn/userfiles/files/zeraxopusaduvatabonu.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/cd90fde4df4062f036dbd24295a59e5b/76602279303.pdf
    • https://glbtrader.com/userfiles/file/mezudexojelipitofet.pdf
    • https://mercerapparelss.com/userfiles/files/85952820329.pdf
    • https://tailormade-sales-marketing.com/userfiles/file/73497118180.pdf
    • https://fiberglasssupplydepot.com/userfiles/files/xatugado.pdf
    • https://alixdemassy.fr/userfiles/file/fagadamipomu.pdf
    • http://rnralpha.cz/res/file/xafawofenimubudase.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/k45grt2ek8kk64i8oa3lr0lgf4/35594395365.pdf
    • https://rwd.webseo.tw/upload/files/surazonok.pdf
    • http://arcstema.com/userfiles/files/91435416731.pdf
    • http://jiji.pgo.tw/pic/uploads/files/lewazepazuxuguzanaxemo.pdf
    • http://divodizain.ru/ckfinder/userfiles/files/30236660818.pdf
    • https://aalatour.com/basefile/b2caalatourcom/files/xusorowujozukatusixawin.pdf
    • https://qualitygums.com/userfiles/file/31082819643.pdf
    • http://westfallassociates.com/documents/file/51101036392.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16139aa1f6a581---fejubisujovitabun.pdf
    • https://inverpalmas.com/aym_image/files/25381949245.pdf
    • https://www.adom.biz.pl/ckfinder/userfiles/files/83564084203.pdf
    • https://legyenegyjonapod.hu/userfiles/files/8832978377.pdf
    • http://mstreatmentadvances.com/userfiles/files/23621970858.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=wireless+survey+android
    • 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_off0000cb4d.bin
2c50da1ce80fc387e1bc2ddff112c7bf9b453dbd046105f12cdebd48d1ab9c14
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4D 10416 bytes
font_01_sfnt_off0000e30b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE30B 16792 bytes
font_02_sfnt_off0000fb1d.bin
ef278253e44ac171232670044a1b3aa4120858cd889941c1c5a616af45f74382
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1D 22612 bytes