Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbdff7389bc6bd3f…

MALICIOUS

PDF

88.3 KB Created: 2021-07-30 07:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b6e234e2a34e38762e58e5eca1bb861f SHA-1: f2dd75b64b9b7cca0d9d063fad3764477a05b2df SHA-256: bbdff7389bc6bd3ff98dfe71ec13428c62f2a393675b40b647854d3f940fd36d
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm and a phishing/malicious document. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further malware or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://nistd.in/userfiles/file/86312778126.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/02bc95e2e96d20dd54779a05a6946017/fofamabina.pdf
    • http://heizler.hu/files/file/jumomesaxoves.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/a9c8a77fb0a49572022e4bb07df158bc/45146568180.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/4ef7ded9f1bae983fb9da9b4ccc266af/pogukubug.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1609762dee9843---77902131325.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cdae76d2f48---66772083006.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf406bea0c---8475253690.pdf
    • https://xo-sound.ru/userfiles/file/lupizik.pdf
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/c8751604a23d470ffb03d2b92bd271b0/likozonavofosaritufuj.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/qst3am7edp4a7k93bvnu9mvrrh/bofarevanulusuwif.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ntjkg1rf9ltd3j3l035covfd60/74659894630.pdf
    • http://ctkupavna.ru/upload/file/lerenawami.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607beaca23ea7---85252628582.pdf
    • http://webbuilders.com/files/file/29319407152.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/b6886fb436b79434089fbfb1374c9aa0/20198599591.pdf
    • http://pomodorolennep.de/gfx/userfiles/files/31720702702.pdf
    • https://gizaviation.com/uploads/files/45782448795.pdf
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15580556068.pdf
    • http://myshopekerala.com/userfiles/file/69408334686.pdf
    • https://citronixdeflection.com/nbloom/fckuploads/file/nazijeledupi.pdf
    • http://technoculture.cz/admin/upload/file/84546460666.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c001dc357---26807889851.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=list+of+spanish+adjectives+a-z
    • 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_off0000f3cf.bin
32f45373c2e6b89cc4da37b990f0fa8840353312bfbf83d08659f90a25486032
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CF 18060 bytes
font_01_sfnt_off000121d1.bin
998a372280a7e89cea51a0ffa009ead7901335147bcf9ceef80b5f7c99c07722
pdf-font-stream PDF embedded font (sfnt) at offset 0x121D1 10816 bytes
font_02_sfnt_off00013acd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13ACD 16792 bytes