Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b4d1f07caae94fa…

MALICIOUS

PDF

62.3 KB Created: 2021-09-01 13:21:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cd65a882d361e97e890982405aa65319 SHA-1: a37509207a50bd6ff13450330ea1f5ea82edde58 SHA-256: 1b4d1f07caae94fa9ca639413bdb52c81786e34f9dbef688ee91798512be4a4e
154 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm. The embedded URLs point to various domains, including compromised WordPress sites and disposable hosting, suggesting an attempt to lure users to potentially malicious content. The PDF's structure and the nature of the URLs strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9122

Heuristics 5

  • 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
  • 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://smidgel.ru/uplcv?utm_term=the+outsiders+1983+full+movie+online PDF link annotation
    • http://bafiti.com/sklep/userfiles/file/46352215189.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/vojaganagegewowuw.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/22027195096.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/wudulozenimefupozigepin.pdfIn PDF document text
    • https://digireg.com/upload/dulivede.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/zikizazejopeveper.pdfIn PDF document text
    • https://pasarantogeldua.com/contents//files/39125298161.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160715341a132f---76229809659.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/17091273802.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/11257135364.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1606d98f95a68b---jurexedo.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210829112405.pdfIn PDF document text
    • https://2acontractor.it/images/file/97188033636.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/5afaafce445fae1f6dfad5bc2f363ff8/nubegudev.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b396139d56---1305153793.pdfIn PDF document text
    • http://kieryk.pl/img/userfiles/file/1355328934.pdfIn PDF document text
    • http://roxburyhs1987.com/clients/63080/File/mogilesa.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/50792287140.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/nudide.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/109c4bddd1545d388aeaae3780cc0dfc/90041452237.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/6803617737.pdfIn PDF document text
    • https://srmhospitalities.com/images/bulk_images/files/tudirelitokos.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffa2a664de---jupedukegolejuwevimiwo.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/19bc4ba606d3fb1c966da033ef6f327b/18794063456.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E0 11184 bytes
SHA-256: e7532c5444aca6e8fc171f55b9ae60139f62b1abafcf1c39ae81272a750ed28d