Malicious PDF — malware analysis report

Static analysis result for SHA-256 af32b6dd0c93f9fe…

MALICIOUS

PDF

91.1 KB Created: 2021-06-29 14:01:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5c5c555cd113177b58aabdd11227196f SHA-1: f9b7d8252f462935d3c764b585f8e6a328dae61d SHA-256: af32b6dd0c93f9fe931556e94eca3f26dd34a7c89d5c32c627c6eeac47bcacfe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites used for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://garglob.ru/uplcv?utm_term=redial+last+number+called PDF link annotation
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160c310706a2bb---gitujovaduwu.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b849fa28492---vewakinedirisurokawutigem.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/5570495207.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/82cbbdf0e7f01f2016a18cd323cb7c26/gabosobaxewanuxu.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/638d22bee494f704ad40c278b2a9282d/fevetavaguselasejirodite.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/juzelazipixugufatiwefof.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/38618454398.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/c3482481e85c813cc400f568375d1da0/97218496715.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608045fccef09---lemosinuvetid.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82a1b94328---sigojajimep.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/xarunodowiriveta.pdfIn PDF document text
    • http://aliotoconsulting.com/clients/862286/File/25572352393.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/filaxupapomoniwabalesoxud.pdfIn PDF document text
    • https://martabaktelor.com/contents//files/1592250234.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/e6f985f9500634c2de4f64938c4a6b31/pusosakixonigakiru.pdfIn PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/38477027593.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c5f48fa00---9609762147.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/23342874902.pdfIn PDF document text
    • https://prosperitas.be/data/assets/file/72962520982.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f21eb0feb7---poxazomik.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/mimaxosidatevopoditup.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/18313207180.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/sedegobuvuditinonoz.pdfIn PDF document text
    • https://eslms.com/userfiles/file/57023195910.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_off000100de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DE 16868 bytes
SHA-256: 78ef9bf7fe2b71ddae0ee4001656576161769b7bd85e8121d1781f7a41ee7680
font_01_sfnt_off00012ce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE1 10696 bytes
SHA-256: f9e54d06441e2332e4f852b9595b5b5bc7f0b54786cb76bd44f10e9c8f85b12d
font_02_sfnt_off00014564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14564 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1