Malicious PDF — malware analysis report

Static analysis result for SHA-256 db798d2cfa3a3650…

MALICIOUS

PDF

71.6 KB Created: 2021-07-03 01:30:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 72c3317149d4309560fbcc11248394c4 SHA-1: dc1e0053404340cc8e96bec81be5c07af781032b SHA-256: db798d2cfa3a36500496b9fbb53e3b8eab03bf099040ba2f5e8f95e9743d45d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of external links and the overall structure align with common PDF-based phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crewmak.ru/uplcv?utm_term=pathania+physical+chemistry PDF link annotation
    • http://guides2alpes.fr/uploads/file/lelirixapoziwikowoxuvu.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210703071138.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/bbc12dc43ffc68263e29dec1e9343a61/23681969622.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/cvdol8ch676g3p5vpt06doefsh/bofakuw.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607b74bc39732---korunoduxibar.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160901af7a04ef---3885246287.pdfIn PDF document text
    • http://land89.com/ckupload/files/danuw.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094a33edb776---xuvinuxasagidis.pdfIn PDF document text
    • http://beulahcooleycollection.com/clients/870349/File/fosiwunewanimexodomawir.pdfIn PDF document text
    • http://zae.me/datafiles/file/salabixuse.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/93332222283.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/207cacde4f9767425da4383d04f79040/gimukoxuzavenumoledalu.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/solibobezunoxala.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/bfeb445ab1d1191f725524cbfc311d62/85861262579.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/54512246609.pdfIn PDF document text
    • https://ptogel2.com/contents//files/tapanaxakoda.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/wujefuz.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16087bdfa5f151---73829143901.pdfIn PDF document text
    • http://willbramephotography.com/kexemotig.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/duniwirewosufutotukijured.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db568408eb---bosula.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/84783859444.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755a8acf047---99748687007.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/41349136530.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_off0000b732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB732 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF49 10636 bytes
SHA-256: 38fca53a4ef1395cd3247daf6832a78e0619e9609bc7381ee2fd16a37deea50c
font_02_sfnt_off0000e76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76A 16044 bytes
SHA-256: a7088a14bf4803be7b7f52b1393cee6711f0dfba958e7bbcc79c03e9e5ba86c8

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