Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e5569522b26a958…

MALICIOUS

PDF

87.2 KB Created: 2021-09-02 09:17:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a5d18f5ca79c6b3c17a7ffe4bf71f783 SHA-1: 8cf92101ad360178cd75a1198bb347d9a25ada87 SHA-256: 9e5569522b26a95811554d5742207dfd08c7bfa0ebfb743aa665cede073dae3e
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress uploads and other disposable hosting domains. The document body is heavily obfuscated and unreadable, suggesting it's not intended for human consumption but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://hotelbelleepoque.bg/userfiles/file/25185693353.pdf In PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/9344a1fa05850a4ff5dee24bb894c6b3/teduromaligajowiki.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/kuwubowemanetebije.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/lidutezafitobikas.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/voxawopasabexolo.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a48512ddb---17473870016.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4c9f04586---bejateleme.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/11232e1ab8043078cc400baef9541f30/11329205009.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/36295355541.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/60545119241.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/46341026887.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/dinobo.pdfIn PDF document text
    • http://baovevietnam-vnss.com/upload/file/51147462156.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/gizepikifogunovunad.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/4ed79a4e85c87039418df62e2415d24b/ziruk.pdfIn PDF document text
    • http://sentai.cc/data/file/20210813_132909_906.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/6f9d3631fc9eab63734f0836d6685bbc/44178326896.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/99359916313.pdfIn PDF document text
    • https://akemi.ro/hirek/file/71905725189.pdfIn PDF document text
    • https://www.thaiahpa.com/flash/files/vedalobajobevulozasimuxo.pdfIn PDF document text
    • http://chinazzjx.com/d/files/piletosedarogagakilebap.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/xegatoferekedum.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/uj6e5s3uckpsbmiv8b70n05miu/18093108335.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079bbb65b071---jizowirawedapavudimisikof.pdfIn PDF document text
    • http://jameshamiltondds.com/clients/6/6c/6cc67b5d90347a591bf4e9c0b97a5143/File/32807503985.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=effect+of+ph+on+seed+germination+lab+reportPDF 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_off0000e995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE995 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AC 11192 bytes
SHA-256: 0c3410a19eca58fa5d45f11b5bd7ed7d8d23ff81c061ad5553cc06d38892a2ef
font_02_sfnt_off00011b36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B36 19692 bytes
SHA-256: 238d328e30c4ea5d0a67fa6d70279b1617f9284a1810849c013d0971eb493e0a