Malicious PDF — malware analysis report

Static analysis result for SHA-256 366286da272fa175…

MALICIOUS

PDF

86.8 KB Created: 2021-08-03 04:50:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 875e331f4baf6a804a325febb27ceb48 SHA-1: 9bf0c0991b2cd6098b9e09847ebb1fd348646bc1 SHA-256: 366286da272fa17532d3de14682b229c9a3dfa737703331ab6ff7fc0a336325d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The embedded URLs and the nature of the heuristics indicate that the primary function is to redirect users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://ketchas.ru/uplcv?utm_term=reading+comprehension+test+pre+intermediate+pdf PDF link annotation
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/bbeb179d44e8503a66ff76c11ca17cf6/jufifuxewokiminojubi.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606eaf9202803---85062023816.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/51859030741.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/kamusojev.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/13ae4c41b5d65823c80fc898d516df14/268588421.pdfIn PDF document text
    • http://coffee33.ru/archive/file/93934990521.pdfIn PDF document text
    • http://trevorhannant.com/mijomiwat.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/dazeboniwog.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/59217842619.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/novisan.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803c360b3e5---47539472964.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/55945c0c7177f2959213b3e21463f259/woluvarakoxufise.pdfIn PDF document text
    • http://indel.sk/userfiles/file/temalamasulijer.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/gesisol.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/funowirutoruzaraloke.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/dinix.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/doluteweguxoz.pdfIn PDF document text
    • http://haniltm.kr/upfiles/editor/files/82697600431.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/cc5db2da52a55d298e2a857f387fe944/nazomuxijatopogabenepab.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/85938576164.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/5beed776137506524cfd9627c865d9da/jobumokazoremepiwaj.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/8635c6d0b8ba387de20913589487a9e3/50464782014.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF196 16340 bytes
SHA-256: 3875a7ba0a51f04cdeb9c709bd6d186883d1053f3ac2b4c410f565c944aa715a
font_01_sfnt_off00011bca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCA 11068 bytes
SHA-256: 02b59d5b4f00255e93f738681c7ea47ae8979d841cc8e4e475fef13e61bc884a
font_02_sfnt_off00013522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13522 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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