Malicious PDF — malware analysis report

Static analysis result for SHA-256 de0f813bbc190998…

MALICIOUS

PDF

69.5 KB Created: 2021-09-04 01:22:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7ccc7b2a93e5ec2152210164fd095262 SHA-1: 769725494854df0017d8752fb479336f69df78b2 SHA-256: de0f813bbc190998f44f87ce131b013768415040c2ff23afd40f7d335211db2a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm used for phishing or malware distribution. The file's structure and the presence of embedded URLs indicate it is designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7704

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://archism.ru/uplcv?utm_term=manual+motor+starter+enclosure PDF link annotation
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a53c5f4320d---40262747035.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e511445a052---9416862306.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/32909953059.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/patadusazomubuzotoximide.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82cf3cafcb---8719801367.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a99c129ffc---lomenixoxejisu.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612c3c3eb109d---kelaruraragugapepovelosej.pdfIn PDF document text
    • http://18554080.com/userfiles/file/lidifevivivarufajovofeji.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/12104878436.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/65746373811.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/dbb66aa0863ec5a8480e9b00ca24ac5b/tedovarolegex.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4a6c9ecb7---97708757138.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/91312349097.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/92737770026.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/89960140267.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/d366a50e987e4d834febf48559d8d9bc/gobifor.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/dajupedenawizafamojeto.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/add2129c09dfc0739ff7673abdd16498/podenelukiwowol.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/raduwo.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/b805bh6qnj5vstgunip5ptadfm/21663307628.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC542 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD54 17556 bytes
SHA-256: 68506c9a71644ca9b0c6215e4d5de2051ef8dafcbbaee01fe599654069e789b2

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