Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f43006bafb47712…

MALICIOUS

PDF

88.8 KB Created: 2021-09-22 23:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ad4266d911d28d6a9b32cdb118365942 SHA-1: 617bc75acf1e3662064582cf8c3bd68fd8b5e0cb SHA-256: 4f43006bafb477128b3b64ae794c27b5a71a4f2b11522548cb660d71818ddd7f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to compromised websites and potentially malicious content. The primary purpose appears to be redirecting users to external sites, likely for phishing or to download further malware, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://philabc.ru/uplcv?utm_term=feed+and+grow+fish+mod+apk+unlimited+money
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/5c6c3e4bd363cfe0b970338e3347c88f/15084918115.pdf
    • https://autoskola-scp.com/files/mifirubenoginumofimuwif.pdf
    • http://connect-event.fr/ckfinder/userfiles/files/63636997699.pdf
    • https://tectrongim.com/uploads/files/norilamezedexupanatu.pdf
    • http://kiemdinhcan.com/Images_upload/files/83484542132.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/73205808735.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/1339d2de90e581895a633cc9041b96c4/bukutesefulebewev.pdf
    • http://yearbookplus.com/uploads/ckfinder/files/24687266912.pdf
    • https://corpeverest.com/ckfinder/userfiles/files/wodajufatunumosuremedudi.pdf
    • https://cihangirhotel.com/upload/ckfinder/files/22631035130.pdf
    • http://autosoftware.company/autoresponders_images/files/judikomokil.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161322d6b66885---54813154758.pdf
    • https://feng-shuiworld.com/userfiles/file/buvuvi.pdf
    • http://irk-yoga.ru/upload/files/gowitufefuxatuborod.pdf
    • http://vuatoyen.com/uploads/userfiles/file/59675711381.pdf
    • http://muasamhangmy.com/ckfinder/userfiles/files/niburufewudodikesodeja.pdf
    • http://skisun.it/userfiles/files/27278876094.pdf
    • http://studiotecnicomartani.eu/userfiles/files/28342242650.pdf
    • http://hugslock.com/app/webroot/img/files/31588835322.pdf
    • http://www.alborada.es/ckfinder/userfiles/files/4039068188.pdf
    • http://neoneofytou.com/ckfinder/userfiles/files/wugotuw.pdf
    • http://sobateracota.ro/mm/file/jiferagojebojebam.pdf
    • http://gzperson.com/uploadfile/files/2921324125.pdf
    • https://safetypadlocks.eu/eurostyl/photos/file/naroba.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/161437142ae43b---95018307290.pdf
    • https://digiconelectronics.com/media/gevizudubiserazufumag.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_off0000f32d.bin
5b78e8dd5955dce8309367a05b4cab5bafa6b4c089c6dc53526314c167a69185
pdf-font-stream PDF embedded font (sfnt) at offset 0xF32D 11316 bytes
font_01_sfnt_off00010d72.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D72 16792 bytes
font_02_sfnt_off00012584.bin
2402d08af46bf4060add2c2dc7aa3ede4a0bf5a005337d71146a8d4a48150a8e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12584 18632 bytes