Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc7d9a6d1ff2a98b…

MALICIOUS

PDF

78.3 KB Created: 2021-07-03 14:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2da28e226a381a8f57e3300073823a67 SHA-1: 221c603f24cd7199462b14493fdc6c192b735756 SHA-256: dc7d9a6d1ff2a98b971cfadcbe93e2cce876c213dc2c5616a398d92bcc7d0863
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL structure and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://emons-verlag.net/testarea/cwsCMSlight/media/files/27286340253.pdf
    • http://e-hematologica.com/users//file/lagodutufufafited.pdf
    • http://stolizstekla.ru/userfiles/file/zivose.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b94eba4df5---jasun.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160d6446578070---sejugibugosadob.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/38a695d5499b741da609916c1be19a82/visujafefagojib.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f98193b85---bexorizijamijoxixekulux.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/f5303c8940049166ce66ea96d728920a/sofebozebobapenozukufug.pdf
    • https://fsbulletsandbrass.com/userfiles/files/bajozute.pdf
    • http://diversecityuk.com/userfiles/file/finapemizuzasaruxuvapot.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dba227be35---fotito.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/b2d1fb49451453b74984282f8b7ade41/43276587506.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/635b0d59aa62431e8ef110b834d9abb0/34118618343.pdf
    • http://alliance-ic.ru/uploads/file/zewugugowogegobeluvikewa.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/5ac99be5c0c6213b593bdee1e9060508/17119052648.pdf
    • http://pwr-tech.ru/userfiles/file/83913609965.pdf
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/64160853662.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/aj59scrs0cd5r6il4396n0v1jf/kiriwejuliwa.pdf
    • http://animalscipublisher.com/files/upfiles/file/8979589113.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/vb4g9i3fih5qnv07nd45v17202/2171123523.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608555c964a23---38997279097.pdf
    • http://be-now.pl/userfiles/file/demozewuge.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607465747ea35---8511436120.pdf
    • https://go2germany.ru/files/file/jofazitu.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5b1d053f6---38577162709.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=five+nights+at+candy%27s+3+characters
    • 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_off0000cfc1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC1 16792 bytes
font_01_sfnt_off0000e7d3.bin
f79665f47de8317021b3b5d09401c0fb785d1be6f2ff6b2396a371ef14170df8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D3 16604 bytes
font_02_sfnt_off000112ba.bin
e2f1b9a81ebd6eef0ab056922968d3cef404c97a1dd15ebbebc69a12ca9459ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x112BA 10848 bytes