Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcc21e612e3dab28…

MALICIOUS

PDF

86.9 KB Created: 2021-07-02 02:58:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ed784de47fd81177a6222206866e6c44 SHA-1: 75d68d89ef93ca66cd516351d5048c92e5db82f8 SHA-256: dcc21e612e3dab2843b45bd84f11fe48e241d5dc9223acfe851af28d1aed8e77
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress installations, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking clear user-facing content but containing embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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
  • 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://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a494522f09b---pefetotabimobajemefexivow.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c0edc693514---75140983109.pdf
    • http://classicalgardenornaments.com/uplds/file/nofuf.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c61f70a46f4---derutikomabusogularija.pdf
    • https://masukpt1.com/contents//files/saletajikilogiguj.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608379814b59b---xisafirarajaxovax.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdaabc8f46---9167493301.pdf
    • https://mysilo.com/upload/ckfinder/files/35887969255.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8d3f38a9f---29485699529.pdf
    • http://zulassungsservice4you.de/bilder/file/98541487741.pdf
    • http://hiddenforrest.net/clients/76790/File/wafewamisakog.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/63ab59720e1997a10881f4f903cdfd44/7082107446.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6b9398f3b---33328872017.pdf
    • http://thuduchouse.vn/pics/file/zumejek.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b228d47bb---96504901244.pdf
    • http://schmetterlingsgaerten.de/file/13564054134.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/340e837e11917fd90c89c3afc5e3321b/16437355375.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d834af81c---76231893536.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c93db5bcd0---mitasew.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/b6e53203388bebaa95943fe7dd622182/19523055875.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/3631ac14b7d66b095821ed4b986f0c67/41530408472.pdf
    • http://tpdw.pl/userfiles/file/vurixo.pdf
    • http://ypperfect.com/ckfinder/userfiles/files/pimimoxuda.pdf
    • https://whiteplacard.com/UserFiles/file/zufezolumamoboziralobom.pdf
    • https://kurek-rowery.pl/user_pict/file/pavajuresagu.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da11e7fa99---59754334516.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=example+of+research+paper+using+imrad+format
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efd3.bin
dedcee8b62245f570f3060aa64da510cbfc24421c9614dd8aba6c19a288574a0
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD3 11252 bytes
font_01_sfnt_off000109cf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x109CF 16792 bytes
font_02_sfnt_off000121e1.bin
ef54449e6e9933c54863cd3c918ba620ba157f42e1542d07a3275081bdb8ec4f
pdf-font-stream PDF embedded font (sfnt) at offset 0x121E1 17088 bytes