Malicious PDF — malware analysis report

Static analysis result for SHA-256 5168a6456e14ed63…

MALICIOUS

PDF

91.6 KB Created: 2021-08-09 23:24:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f1ea5540631c125ad1676aaedc0f2cc6 SHA-1: f81cbad9bb7fa307d1757f992b09c9703fa2c90a SHA-256: 5168a6456e14ed63a96e0ddfc6b343ae761a5ea28417f0c4082a53a385c6ef92
164 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites hosting PDF files, likely as part of a phishing or malware distribution campaign. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/68ejj8v4v7eefs0dbbcld7fpa1/bijedadu.pdf In PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/e9b2328e8047b66d700099644e4a7459/mivadakibinenisabifet.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/nepokobumuvosonifenax.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715424bb7a1---xiremewugoripuw.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/lamagox.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/sofuzabipuwubenapobora.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/62668463426.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/3388aed6ab216c5969b1ec28dbaa0f42/vowoxofowotefuwetomogad.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///47492933557.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/mbtgom0a1sd36v0nbe0jgleh5f/rijejem.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/tomatarufigivonutuku.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/d66acaf99fdfabeaa8e9e12713dea14d/65307285041.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/cb75d20171df7c5ef11ad0d815edd07c/32704138278.pdfIn PDF document text
    • http://fygl.net/uploads/file/01194600583.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/66f8ef9047f9cba7ca5e922c0e4eff20/gasaluxojebimewamupamuxu.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/lepokotato.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/be032b7b0ba0a38c5b0c78b16921c5f5/12715654137.pdfIn PDF document text
    • http://simonide.org/userfiles/file/14535517166.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/ronifobinawawadepojab.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/31040437772.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/6f2lfsl69sha39csvrm5q4ob8s/sawibosaloxonelexilaj.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b5889a051---moxuxesudozepumowex.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/0ebf5d7802c0055f9e21bd2946fbda59/37446669659.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070477362be4---39900440334.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=what+is+jj+smith+10+day+green+smoothie+cleansePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB9 11228 bytes
SHA-256: f6118f2ac4d205ec9219bc67a3992043acb8766e34093ffd9bad496f01f58cf1
font_01_sfnt_off000117a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A7 17632 bytes
SHA-256: 77c3c134257601d2b95eddd97160defc684a1ecf2db3f96140d69c7ca088961d
font_02_sfnt_off00014603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14603 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1