Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ccfbfe2001cde16…

MALICIOUS

PDF

76.4 KB Created: 2021-06-30 08:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6875750ce795dc8a347ac42aede63bb9 SHA-1: dbef34c19e2158f92ae897383c870f52eb7a1ab5 SHA-256: 0ccfbfe2001cde1650da88d5dc6e52fadfc647cdf8d35379558b0ba00836a2ad
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure suggests the document's primary purpose is to redirect users to external, potentially malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088d5e754959---41582192607.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef61235afb---76130128413.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/ih6fl800u7qekkh1goqdhc24ni/25206134448.pdf
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897b4c0667a---fonoba.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/a1ec9cf3d749e1edec60670fb649c977/23107192483.pdf
    • http://candemdientu.com/Images_upload/files/82669784361.pdf
    • http://altaprecision.com/userfiles/file/dusabedifagu.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3affc7ae4---45474621212.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160aab72ccd1ab---19894659793.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794791ee910---87370459952.pdf
    • https://tonitomov.com/picture/file/6316343319.pdf
    • http://daimarconstrucciones.com/images/admin/file/lejufekifupiluzofe.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbefa5b40f---13530909206.pdf
    • https://patc.fr/imagesfile/1235149817.pdf
    • http://plastikacz.cz/soubory/files/pesezone.pdf
    • https://chezgregoire.fr/userfiles/nazobepefilixibu.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/77ecm6nok1o557juef4cviebc7/pesusiropox.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785162bafea---vatilipekokagajanava.pdf
    • http://onlineexpert.in/userfiles/file/zibimakebukoboratijoz.pdf
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/a593a1a2b381cf66e53b8322acceb6e8/wotetidefoboki.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160915fe33d1ab---98311228687.pdf
    • https://akproauto.com/nbloom/fckuploads/file/toluluwazorodinawatimijej.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e35af48c6a---bidasujutabawagemiwofi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=morris+lumber+and+millwork
    • 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_off0000c78d.bin
be1a60115b179f36384002dc00bcb5da9a1c3142517147736fcec3d4c13f6305
pdf-font-stream PDF embedded font (sfnt) at offset 0xC78D 10720 bytes
font_01_sfnt_off0000e02f.bin
102ddab5bc027b98f0cca4dda666589564b80b71c5d15c1c91376b67350d8d23
pdf-font-stream PDF embedded font (sfnt) at offset 0xE02F 16992 bytes
font_02_sfnt_off00010c24.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C24 16792 bytes