Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1436d47141d8f3f…

MALICIOUS

PDF

109.5 KB Created: 2021-07-06 00:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f86e27a54144cb1910c33e11dd2deaf9 SHA-1: 5bb146fa2c0ed04f11e5d096b97f2d732bbba123 SHA-256: f1436d47141d8f3f72260a981ebb2c92a6cc0b09a38b4779f9827fa2555ccf00
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/4f55bd318b393e9c8b8d81f79b19f12e/togegaga.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef9d3f24cc---sifabozadug.pdf
    • https://kovosluzba-praha.cz/res/file/24106763159.pdf
    • http://textingrights.com/userfiles/files/getamexem.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/4pgkvo3ph1mla66h8acchk5r10/22993881176.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/jbttg2a0cvnak4reeqo176gr0m/146027226.pdf
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/6ae99d8c72d31a1af981c534d08020ae/lesefazidefixe.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/4579200603bed766937cc15f629d42af/74391732104.pdf
    • http://mastera-mix.ru/ckfinder/userfiles/files/sivusuxazanuzojimimavam.pdf
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/bijixawudo.pdf
    • http://gld-lining.com/user_img/files/25306821996.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/egs466amo0qqan2ua3dh7in8e1/48988237578.pdf
    • https://laps.pl/userfiles/file/88233224437.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/5882ltfccl20oik29v6qg2f2tt/vulisomodiniso.pdf
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607315cde6ce8---vonosiwexujapuramip.pdf
    • http://orderkai.com/uploads/files/posaxewoguxaxivutuwod.pdf
    • http://aristosaigonhotel.vn/uploads/files/goxasumobaxuwa.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/16fdc34fe6ed5c0e8edc3c67dd8df55f/jukalawejuletenezekuwa.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/481e0c54be8f711dc48d50d8341510ae/wobojijenakepuxawo.pdf
    • http://wallsfamilyreunion.com/clients/876683/File/76446963846.pdf
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/dejozopiz.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=i+lost+my+soulmate+quotes
    • 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_off00014cbc.bin
b753453ccaccf3fbc33f7d74bda9829f1dc7ab3e8547840214ab31a775f11103
pdf-font-stream PDF embedded font (sfnt) at offset 0x14CBC 17412 bytes
font_01_sfnt_off00017970.bin
cf88e0661c4b0f51fa689d4ee9c11c4a916a78cc1ae604b20d529a43aebca094
pdf-font-stream PDF embedded font (sfnt) at offset 0x17970 10284 bytes
font_02_sfnt_off000190bd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x190BD 16792 bytes