Malicious PDF — malware analysis report

Static analysis result for SHA-256 213d287dcd4f15cb…

MALICIOUS

PDF

88.6 KB Created: 2021-09-05 14:21:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: defc8088872a47245002a49c343b821d SHA-1: 64217803b6ab217499485e6e29c4cbe15ff5a0bd SHA-256: 213d287dcd4f15cbaab463ace978736303d179882cd4f551c2b7ba47d063aa85
164 Risk Score

Malware Insights

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

The file was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. These links likely serve to obscure the final malicious destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/ab875a0977120887a003c5c7d102b553/fefodobaxevi.pdf
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/giguta.pdf
    • http://beautybybelief.com/admin/images/file/29494982917.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ad685ef61---sizuxejozili.pdf
    • https://gotoko.com/cmsv2/upload/files/nivejuxebevefivojuse.pdf
    • https://eatorhours.org/e-bussiness/fckimages/file/33194053293.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5d1fedf0a---46002547391.pdf
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/nimom.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/8oslg3fkkq8ttd94ssuie234uk/nivaguxinevoribilaz.pdf
    • https://biocoils.com/img/file/38356922048.pdf
    • http://dansecyr.ca/pdf/file/19125138427.pdf
    • http://miet-boot.ch/images/uploadedimages/file/27760929744.pdf
    • http://zrdb-drogbud.pl/Upload/file/kezumuzumaxijebax.pdf
    • http://12shio5.com/contents//files/vojiwamis.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/uv30sgeqs4pc1i43sq8lgoir95/jekazexelibutamujiruniv.pdf
    • http://lafayetteconnections.com/clients/52818/File/gefewude.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c043fb51fac---69584042145.pdf
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/puwuf.pdf
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/bbf150f2dcbcd285fe952685750a42c9/sofamotolinufituvedijo.pdf
    • http://begemot-rus.com/uploadfiles/file/2021081917170373499.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/4cea5205cc2b1ecbf737df5f7659113a/filegiwabov.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b5796e3fa---lifuzojawojofefunotugo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=geberit+aquaclean+4000+manual
    • http://perfecturology.cafe24.com/upload/editor/imagefile/90208899164.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_off0000ed8b.bin
e3b3098a246e9ebd277340072d017dba7aa0eeb72033e05cfd95cddcdf8269cc
pdf-font-stream PDF embedded font (sfnt) at offset 0xED8B 10728 bytes
font_01_sfnt_off00010632.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10632 16792 bytes
font_02_sfnt_off00011e44.bin
73670b2bccc9b88bdb9ea427441afe783bbb3c4194dcebbde8e732368af918aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E44 20668 bytes