Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbc68adcfc583223…

MALICIOUS

PDF

74.6 KB Created: 2021-07-04 14:14:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f4c50ccde9ccded1d8baf5785122e042 SHA-1: 75da5488c078e2a2b8189ce2aa517d2069bb4e9c SHA-256: cbc68adcfc5832239dcbaad93a77b92e8b80e3dca8548291c2be145eed4cd110
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 websites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. 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 0.9971

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 https://worldmedglobal.com/userfiles/files/bexuvudo.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/s23l4t36lf7u8dvcev6omdcbu6/8567683458.pdf
    • https://secolink.sk/userfiles/file/67113365355.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/b7ece53c019b83f51e1a4a8326dfb658/27926452157.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609075278919d---16036757713.pdf
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/807ad9c60b4a7e06bc708ed979c67347/51487585684.pdf
    • https://feng-shuiworld.com/userfiles/file/rawixemaxaxerav.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5fb5ad50885d86ff59bc1ab78d69290a/kagekizajowafowuwunupiba.pdf
    • https://bruceautoservice.com/files/file/jezasuvatagigozuzabij.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/h2n6g33b2jajhu682htcpf6mv2/tejuj.pdf
    • http://cascinamana.it/userfiles/file/48140074198.pdf
    • https://businessservicesuk.com/userfiles/file/rifonexodigumaja.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/1f2f7523ff827b6ebf96d1c55c28c250/tasonuzaw.pdf
    • http://exlluprimebrochure.com/ckupload/files/peniwuviziguj.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/a5n54m1gqk61omnbp9q709dc5m/rikuremafeboxodija.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160706be01b2f4---kopozizedopojej.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094b3802880e---tisubewipiguk.pdf
    • http://africanhairbraidingsalon.com/userfiles/file/95845304524.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/505b21f9db68d12187e6b2021c30bb6e/pixenomeju.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/90c4a621265c3bb0b019e21491fdff79/tusopeberoz.pdf
    • https://anyimaker.com/upload/users/files/25036074047.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=what+can+i+do+with+a+twic+card
    • 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_off0000c3b7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B7 16792 bytes
font_01_sfnt_off0000dbc9.bin
acddbf89624edf2e35b4f32ca427a832fa5adf5a48a05e484eae93967d586393
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC9 16436 bytes
font_02_sfnt_off0001069d.bin
eff9f9482d91657eee69df37729af2c5a63726ba08e6f66b97a5776a501afdda
pdf-font-stream PDF embedded font (sfnt) at offset 0x1069D 10200 bytes