Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e3b931cfd83d230…

MALICIOUS

PDF

78.7 KB Created: 2021-06-13 03:48:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 0c06eb7941d65392719ddda00c3402c0 SHA-1: 2bc94674118b4f28f2bce0096024edaf80afe429 SHA-256: 7e3b931cfd83d230d96b2dd87fb3ca1b9bf9e1c148b84558d73129ffd8e7c020
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains multiple links to compromised WordPress sites, suggesting it is part of a link farm designed to redirect users to malicious content. One of the embedded URLs, 'https://chcial.ru/uplcv?utm_term=gta+5+download+apk+32+bit', indicates a lure for downloading pirated software, likely leading to malware. No scripts were extracted from this sample.

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://chcial.ru/uplcv?utm_term=gta+5+download+apk+32+bit PDF link annotation
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/c9bbd269893f1c475d3150ca35694509/xudonewigobafegifaximo.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/di4f5marlovfmlv53euvao1onm/vediro.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/ghalqi53rgb394stgr6l374u4o/5621536858.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/8342v91tg8r7vtdmmf37igdn9c/72984826502.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/thkj64g04n4aen0hm811bopbt7/24808820385.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080d36f4f984---nezabowugigitobamok.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/e5faf39aea83dae1fdb2a627f4d23fac/30666450603.pdfIn PDF document text
    • http://haphadoor.com/upload/files/31848563964.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/5mvja46okk2dficear7v9p9454/91068263366.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/xigelokusunesupinitorevop.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609b49e3eb7cb---4345865649.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/karevebewesuvanigizilomoj.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/66414515450.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/48206498488.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b0834309c---59645335415.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/bad4390ade38d8378a2df4c45b394daa/gugisezizorerene.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F0 5428 bytes
SHA-256: 58e7dac39f3fa88f75f3a8d30266f33e6b4a5741e0d142fe69fe11e51aeb65a5
font_01_sfnt_off0000fa95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA95 23452 bytes
SHA-256: 7cad208eddb1a592c4161c50908b2f41cdb259348252c3f4fb618d61459f034e