Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7ff29dc95112b14…

MALICIOUS

PDF

85.0 KB Created: 2021-07-25 05:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1b6e3fb496e1b021e0c9e1b03a331e66 SHA-1: 712a7a29cce8cbaa377f3c5e820ab07ea29a858d SHA-256: b7ff29dc95112b14c3ac93bc92f3ac2dd748b202038691a3a32cfe1d2e74721d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with many distinct hosts and URLs embedded within it. The ML classifier and ClamAV also strongly indicated maliciousness, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of numerous links, some pointing to compromised CMS uploads, suggests the primary purpose is to redirect users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://paillasse.hu/userfiles/file/19050893845.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/1640513a38cfd114e21f5e0032383277/jumugelokoxefefoxaluto.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/d887ecb154e5e9dbc442b645ca5ad198/sezogabaxeti.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/427aedef31a2253b0c64bd9cb4307e17/51338626473.pdf
    • https://cmfnepal.org/userfiles/files/50917302499.pdf
    • https://aquarell.ro/userfiles/file/nasipetoz.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fa73bbb326f---28237570849.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6e7f4583f---83885158066.pdf
    • https://topupdana.com/contents//files/tegagan.pdf
    • https://delphin-restaurant.com/ckfinder/upload/files/3568338741.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/21c05ff9fd67caf71304bb2dda9d14e9/xukebefu.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/9o35ajsnk95ljs5ntl9s68j1k5/76088547019.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e23cd53b59---32238736801.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7bfb5105e---nizoxanuzetasulusi.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/b4a8621fa8605097129a65aaf625fdf8/68648162272.pdf
    • http://biometria.pl/photos_fck/file/berutu.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/af5aa35be3104ac94ce9e75d666f293e/30227827843.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=bahria+town+karachi+precinct+27+new+map
    • 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_off0000e8e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E8 16792 bytes
font_01_sfnt_off000100fa.bin
576b1da3a9c75ed7143c69184d0faa08d8dc18e311f8d34f3a48c42c58998f37
pdf-font-stream PDF embedded font (sfnt) at offset 0x100FA 16872 bytes
font_02_sfnt_off00012cf2.bin
a73742a6e61bdea13a0009e9eec4ba9b73d85ecc429017390d2a37439e553a5f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF2 10828 bytes