Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f843553d11647b3…

MALICIOUS

PDF

80.6 KB Created: 2021-09-11 22:20:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5eddcd7fd6dcdb5eeab8ffbfa0166b5c SHA-1: 4aa40949f7dea3a670f2afb039cc6e405435bfec SHA-256: 0f843553d11647b31252de46d9c3978f17f7d764b320b571568ae1fafb63e043
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7068

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3bf31f065---62672065008.pdf In PDF document text
    • http://vip-cond.ru/userfiles/file/83210641049.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/165b462b6c1d350676de133fcb035374/27137483488.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/93899515881.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/82561163188.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/011316ea7bd140319d0defb15771fd77/36163332888.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/vujadatewulafe.pdfIn PDF document text
    • http://regmac.net/userfiles/files/xodar.pdfIn PDF document text
    • https://lesura.net/userfiles/file/92566996738.pdfIn PDF document text
    • https://jurad.eu/files/file/dokumofusazatovu.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/34163146975.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16131cf2f9dcff---beletawesafofepojajobu.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/goburadupefivovoragob.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/36399848706.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/guvuxafezikuwew.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/wowozobadorogotepapogal.pdfIn PDF document text
    • https://tch.lu/files/files/27296809736.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/zirefaku.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/11408530254.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/94758045461.pdfIn PDF document text
    • https://podimercrm.com/img/files/13506934686.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305f59cd820---43050836237.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/osmb3gh8coiv06n7mpcqjfqce0/mapapalibupafifokebobuj.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/21162666057.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=remote+power+off+apk+downloadPDF link annotation
    • 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_off0000dad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD2 10624 bytes
SHA-256: 2c1814e64d463dc4385c8ebce3558cf2a714f3eb82bae0e44ec3008420ada0fe
font_01_sfnt_off0000f325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF325 20040 bytes
SHA-256: 5ffe571e9e5ac09d14f6c3f47b935b88444d0b5b2c0ac268387c3d9bdb66f4da
font_02_sfnt_off000127b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1