Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ac9c1679fc79345…

MALICIOUS

PDF

87.5 KB Created: 2021-07-04 20:23:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d43e97944832e8e3f5cfef9965e67265 SHA-1: d213f794192325514ebe9cfba6e75cc7d1cbe219 SHA-256: 3ac9c1679fc79345a46a691f5f6f6077587f6526ad2f69f39cdcc79d7bcdb6d3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous URLs, several of which are hosted on compromised WordPress upload directories, indicating a potential distribution point for malicious content. The presence of these links suggests the document is designed to lure users to external sites for exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://karmand24.ir/basefile/ehotel724ir/files/66727434181.pdf
    • https://aimara-bg.com/userfiles/file/42092630282.pdf
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37498651844.pdf
    • https://dm288.rs/slicice/file/10865318973.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/15f7eebb52c80e69b295e1a1e3f7e4f1/worotawowipik.pdf
    • http://dogoxuavanay.vn/uploads/files/27675966766.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608975c79a81d---2082021732.pdf
    • http://portalcom-b2b.es/img/user///file/_0380702001619827533.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/d962d182ed80db85a88ddefcfe2ff895/zefow.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a36fef355---fenefan.pdf
    • https://akproauto.com/nbloom/fckuploads/file/taselirudeseleranakab.pdf
    • http://astro2sphere.com/admin/images/file/57823476470.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae313c91389---jibojibegesamedubixune.pdf
    • https://mmagame.com/userfiles/file/40399851362.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e48dc4d34---puxuwujowonopabitufosuvul.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a69ee996a---ratulari.pdf
    • https://ises.ca/phpsites/vertical_living/uploads/file/vudidevabogobinakameb.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/6vopniq30h1fugar012tscusti/92687106845.pdf
    • http://goergenpainting.com/clients/0/0d/0d1038892961fdbf96b6a8e7e8daca8f/File/5372140432.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/a6a2e4f3b4edd34ab8281daf1f2f95bc/kelagezexemag.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aec5d82dfb0---nedexerozibigilajo.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096f7045f849---36463976779.pdf
    • http://abpaluso.com/upload/file/90767410614.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d136b0921---80141494023.pdf
    • https://dm288.com/slicice/file/sizokati.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/ouoil4jp1lgc5i5ejrq465vfdi/76012218406.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=hp+lovecraft+the+great+old+ones
    • 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_off0000f138.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF138 16792 bytes
font_01_sfnt_off0001094f.bin
9d1489d87ad21dc445db3d62ee7d1d4c76c836d7813cc973186dc9f0c48a900e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1094F 10864 bytes
font_02_sfnt_off00012229.bin
795eea01dc930858466881f7e589aeaeef23e8c58428be8099103ae009346e46
pdf-font-stream PDF embedded font (sfnt) at offset 0x12229 18192 bytes