Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9c3d622f1668a72…

MALICIOUS

PDF

96.3 KB Created: 2021-07-03 03:36:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 62268bce490a0bd475ef4347fe391fcb SHA-1: 160d1dbf0bb2e831fb55898177b7acb87ff8954b SHA-256: d9c3d622f1668a72efef68dd0fed7b5abce55bfa4f57dda6f96447b93b0c7187
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to host or redirect to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2c06af1d64---totimefupesebilokatug.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac77593a731---87830406961.pdf
    • http://akvatoria.by/UserFiles/files/sajufo.pdf
    • https://medosojewellery.com/userfiles/files/fisoxetapudobitadojeb.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5118d1482e---53568510298.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bbdcb456c0d---vujolutotalifawimitasez.pdf
    • http://edu-family72.ru/content/images/uploads/file/xunatusotaduzuza.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b279c65a6---94076265525.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/ipo4oqmcfdd59jokme9iid053c/11761076576.pdf
    • https://monyetjoget.com/contents//files/jojumow.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086edc71cde8---17117635224.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ad0d36587ae35239d640d8a808a972d0/davimuzewoloxekulajegu.pdf
    • https://profipreklady.cz/www/ckfinder/userfiles/files/nenewemowutagotibekur.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bef0fdd9d3b---lineto.pdf
    • http://ylgems.com/file_media/file_image/file/2136544231.pdf
    • http://palcev.ru/userfiles/file/58811250159.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607249929c1e3---najojiwigujume.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/c14353a5803ce5991305d419652d2a55/xemimovisefarokoboreniza.pdf
    • https://securityguardsupply.org/php/uploads/file/86291176425.pdf
    • https://kipass.fr/userfiles/file/pokuko.pdf
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/sumivokevanigitos.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/p6bkjeqbnnf62ehso8v1p6150d/81704578048.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=study+of+digestion+of+starch+by+salivary+amylase+and+effect+of+ph+and+temperature+unit
    • 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_off00010be8.bin
d69a97a7cedc24707240ea0822e3c7fffd8f3f309358defa65d56a8d65138b31
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE8 20296 bytes
font_01_sfnt_off00014054.bin
1b5ec370a69cad3ecd49fc4de041089129571e25dd8751c70698a88c0bdbf3d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x14054 11560 bytes
font_02_sfnt_off00015b32.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15B32 16792 bytes