Malicious PDF — malware analysis report

Static analysis result for SHA-256 c17526a5952ac514…

MALICIOUS

PDF

75.9 KB Created: 2021-05-13 07:18:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6da07cc3651735423295c5b71b404e9 SHA-1: 3591ec524f2d9959e4a3facde9f9a97d851da317 SHA-256: c17526a5952ac51421903a9960496976d0ce42fd812c43958089d5fa74a65e1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The heuristic 'ML_NYX_PDF_MALICIOUS' and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards exploitation or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://medvor.ru/uplcv?utm_term=image+background+remover+free
    • https://abofahed.com/userfiles/file/mufimasaxid.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/be10d1a978e600df2db34d5022f25960/30657267575.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/662055a8f5565c0a2197f95e4bf1b0c4/vudabexejijixuwovobisumub.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16086ddccc7551---vefunabamotuzo.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/abf0eeaf93089b407ca52370f98f0b25/24747475449.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a448ddfc3a---74648880304.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/lc8lfrvj1kf4sjff59m1mbnt1l/3622520017.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/56a1a8ba8a40ef7a9363bee67f16709b/setuvugadefimozufo.pdf
    • http://apcmagon.com/userfiles/jogadoxopixatoxafupu.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160724709a7538---doxiw.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16088480194d4c---84299583497.pdf
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/b25150a7d792e7533dad906dc6a5f442/7292677709.pdf
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/3953d3329ca384747d28bdfc803f9b11/79357612421.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be6452cb96---pazizebasevilo.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb1bc4aa6e---gupurasabedowekodinawox.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dda2a42ee4---81561865512.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/f6411cdba9427e2327540a64d66af687/zibogorofadigobezes.pdf
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/48aed5949e05d1eff0ce9248e60a66b1/90116235112.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/b5a1d7f6a3bca378169c5047d4693d07/96417198780.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed8e.bin
1e9534c676039eb3394a64bde0dc7c576fddcc44d64217d8414edd3855abc06b
pdf-font-stream PDF embedded font (sfnt) at offset 0xED8E 5332 bytes
font_01_sfnt_off0000ffa6.bin
8da18cb302c873f419500eb1efa9bc94b6e62fff816aa19c8a15a99fe62a9624
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA6 10320 bytes