Malicious PDF — malware analysis report

Static analysis result for SHA-256 fad78bfb2228d5e9…

MALICIOUS

PDF

85.3 KB Created: 2021-06-26 23:26:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 29de4ffdc40084b89ba128d876010249 SHA-1: 481b2f9bda7aa11cf20405797925200bd213aad3 SHA-256: fad78bfb2228d5e93753e20b36d80b31ee4dcc086e92b340fd9b1957f1547f46
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised websites or disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or downloads. No scripts were extracted, and the document body was unreadable, but the link farm structure is a clear indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://nhs1980alumni.com/clients/878257/File/15942552276.pdf
    • http://classicalgardenornaments.com/uplds/file/45556458736.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1a34e8044---jifamobe.pdf
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/8u1cam780nmfqepjesk51kpn81/ganupatopozujezapirul.pdf
    • https://asthasupermarket.com/userfiles/file/99251687648.pdf
    • http://wagnerfamilyreunion.com/clients/866685/File/19472840762.pdf
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/17667367651.pdf
    • https://icbacademy.com/upload/files/9191779372.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5012f3b2a---70196967412.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e76795041---17596946820.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9c252be26---32383685625.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/eikbpk1qgt5ut1vv2hlmvp7q4t/daseweguzerebuzixa.pdf
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/d07d6d62ce150e4115af737a9d2fb672/fevim.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a81d356c1f---35809919146.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/vb4ktso6i8sgbtghe68dd4di12/zimikezulidakewefitoxe.pdf
    • http://apsara.ru/userfiles/file/bakodon.pdf
    • http://www.houstonorientalrug.com/ckfinder/userfiles/files/sumemunanugakasosam.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d2a641521ed---77796156397.pdf
    • http://webursitet.org/Files/file/nibexemitorebuxoku.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f22cd5ca6d---varutotogime.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=personify+letters+in+a+mailbox
    • 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_off0000eac8.bin
80baeb499e1f1a36cab047d97eeca106bb478014481d42156e71615a7e077880
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC8 10732 bytes
font_01_sfnt_off00010383.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10383 16792 bytes
font_02_sfnt_off00011b95.bin
f3a97bf52b71dfff26b2d20ab719d62ab60721137934d561ef089d5e5c5e928a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B95 17256 bytes