Malicious PDF — malware analysis report

Static analysis result for SHA-256 379b38ee803bab9f…

MALICIOUS

PDF

68.0 KB Created: 2021-07-21 01:42:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3daec44d708d9e4ca0d2d8fe56a1d2cd SHA-1: c7695855f1912be1ea4361da6416931bb265ba8f SHA-256: 379b38ee803bab9f8f4ad66d34030c02d98a2ae2aa1b79cb36b5ea420160409d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical for phishing campaigns, with multiple links pointing to compromised WordPress sites. ClamAV detection and ML classification strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, but the presence of numerous external URIs, many hosted on potentially disposable domains or compromised CMS uploads, suggests a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16095258b365b4---55253722631.pdf
    • http://tdbakademi.org/userfiles/files/15652548937.pdf
    • http://feach.ie/images/uploads/file/wasepa.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab789f93da6---18413994726.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6ac951a55---66671823069.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608917f931c5d---lifasokubetubigovalakij.pdf
    • http://ciskmv.com/css/file/lajipag.pdf
    • http://ziconiavip.com/uploadfck/file/wojagivixitegimafinugubuk.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/a1501663b96d5e83f2db7d76d45d9000/86455849656.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/e81c593040d222422369602ec17251f6/xafuvuj.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/0dd4672b6dc30270f1dc6b8671b73193/puvuv.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/056b24a6c9e3d5a682f18836058d0539/15986252188.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/smaspfnun59je9ogi5sc6n91lg/66140365283.pdf
    • https://airbays.com/userfiles/file/11270045438.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7dda779c2---13534261418.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ad04e9245ef---lifek.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dcb2d8bec---pebezofuxerofuku.pdf
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/8dea940aad683e72e7f12f727a0be14d/56563450287.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607a13dc00307---vupodugufojifopubib.pdf
    • https://marljivo.hr/UserFiles/files/voxulasine.pdf
    • http://olddieselparts.com/ckfinder/userfiles/files/12205233764.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d168029d4a---koxarizizimaxelobubozenef.pdf
    • https://stopserv.ru/files/file/jobezexafiwur.pdf
    • https://www.comperat-89.fr/ckfinder/userfiles/files/suxonozevawumona.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=dplyr+left+join+by
    • 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_off0000b20c.bin
f939778111419887f775bc1bab6865a4ee4a1876e0ca4cdd7609ce2c1929565e
pdf-font-stream PDF embedded font (sfnt) at offset 0xB20C 13556 bytes
font_01_sfnt_off0000d38d.bin
e6965ec63977d23ba42c1f663ab53d746c61e841ff3fa20cf5025f2cc984cd7f
pdf-font-stream PDF embedded font (sfnt) at offset 0xD38D 10404 bytes
font_02_sfnt_off0000eaf6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF6 16792 bytes