Malicious PDF — malware analysis report

Static analysis result for SHA-256 20d9a5171cb14455…

MALICIOUS

PDF

83.4 KB Created: 2021-09-08 04:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0deab5b69d6ecc1638ce5935ab672a43 SHA-1: 381e664da12ea0e15f5fb96cf2299c1c80c051dd SHA-256: 20d9a5171cb14455db2cf9ae003f5cf45ef028b3892d5a8930c987cc35af3b06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm. The embedded URLs point to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no further context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16087bb4da1da8---tokisubigi.pdf In PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3b565a26c7---25860114359.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f197a4cc7c---68781494714.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/46205398532.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/dilalepesafivapede.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/5a56f2f07145450393163fd5bbb3cc85/58464760268.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/kulaleboju.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/f687c06f01a405b1867a146738ef49cf/temika.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/kosinejibu.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608e86e2d745c---duliwijev.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210721_D813FCA6B802E251.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/d0644f6f33f5fc4952955e62d6d39102/92556279568.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/16672176943.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/df3720107bda8b10f0cf77bf6c2c9c98/79474735878.pdfIn PDF document text
    • https://voyagerf.ru/wp-content/plugins/super-forms/uploads/php/files/0175e45f94c48a4a6f734f674de7ccf5/pusirujokebek.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/81a35b2d86631e145ff1fe44b3748ba2/39421114464.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611baed71df30---zaxafakozazuxemuw.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jabenizuwojexotodex.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/08-01-03-59-04-10.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/c0a4dd944a345cd113d5dc40db31df88/55854545841.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/gezajijolaxob.pdfIn PDF document text
    • http://propellerclubsandiego.org/uploads/files/sajamodojovujupo.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/65303966445.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/aae239d36e02f9cfc0732eda8bdfbb87/pejunugiwe.pdfIn PDF document text
    • http://lse.hu/userfiles/file/50044273142.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/c9798b16313b16438885026f750e0260/36612659072.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=year+10+english+worksheets+pdfPDF link annotation
    • 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_off0000dee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FA 18200 bytes
SHA-256: a1627f2722055fd67c910144dc1a8281f2bdda952aee58696ed18d605ef196c1
font_02_sfnt_off000125ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EE 11112 bytes
SHA-256: 2e510ad0aaa35bf96f079a1c29780dfbae5b1610d0a2706017e48c43e5e4b750