Malicious PDF — malware analysis report

Static analysis result for SHA-256 c63f176474f8feec…

MALICIOUS

PDF

94.9 KB Created: 2021-08-05 13:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eb3aafaf7ca0454d779dddcc4d347937 SHA-1: 887a13bc2c298d1ba7973d2d3c175dcb1daea837 SHA-256: c63f176474f8feec686e2cf5059d1223df626f585a4b6b7624085d308c6229a8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories and disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://xn--90aoj0agf7cq.xn--p1ai/uploads/files/10108977168.pdf
    • http://didula.com/img/file/vugufodosexufifomij.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c88a3e360---97307242029.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160719f7da26a7---81089642131.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f71a5588640---xakuv.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160943c43cd048---92510618157.pdf
    • http://leaguengn.com/userfiles/file///68813231031.pdf
    • http://beiwendq.com/userfiles/file/81239600653.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/c918d562a5788c4e6ff0cc31284c41a7/14699988125.pdf
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/7cb81d603aad77c9d2cbc4821d1909d1/77098231874.pdf
    • http://mylodge-naoshima.com/59295699579.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/975085955e334dbadd1faf7dc7837db3/fetenuvekazanemalakifadoz.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160dcd610c5580---58754444988.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/eoccn68mo6as75ht7in03ak914/53487598912.pdf
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/88550477230.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160918942668cb---7241646582.pdf
    • http://christopherdallo.com/file/89805939020.pdf
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/46357969166.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/90f6af2766a4e915f92eea7addb6bf09/vovar.pdf
    • http://falegnameriacastiglione.it/userfiles/files/bosirapogodesugul.pdf
    • http://dalnoboy.net/data/filestorage/upload/files/76231853843.pdf
    • https://kildevangen.dk/files/dafelizesoguzojolelisuw.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=calculating+net+force+worksheet+answers
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/vabolapatuvileb.pdf
    • 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_off00010d42.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D42 16792 bytes
font_01_sfnt_off00012559.bin
4176cf581270f60427f9e9a9e152720e9e154c90eb7824d4593ba0e329e42d12
pdf-font-stream PDF embedded font (sfnt) at offset 0x12559 10924 bytes
font_02_sfnt_off00013eb9.bin
01257e7f5d6effe754a2d75766b5c16fdd38b3704f5a65dbd93664a8f1d133f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x13EB9 17732 bytes