Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8f560e61b7d8bc1…

MALICIOUS

PDF

70.7 KB Created: 2021-10-03 15:26:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fb1d6709cfbd24ac79a176395644ea47 SHA-1: 5ec08719bf0dbeec8e4391dcefc5f1063bcb5fb8 SHA-256: a8f560e61b7d8bc1eae70f029a60ce7e69d726996ae08cf245ead373442307f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. ClamAV and ML classifiers strongly indicate this PDF is malicious, specifically flagged as a phishing trojan. The embedded URLs suggest an attempt to lead users to external sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/329417e11d3b8ff870dc765b41008697/debivomis.pdf In PDF document text
    • https://gtijsr.com/userfiles/file/42619910348.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16140e158ec5e7---mogukapu.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/2982808238.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/01o4uhtj86ddv5qh85d0a678hv/zabegimatagogi.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/fifolexufexudaxenagoras.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/565864220.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/61cc9e5b43cf8384a7f9d5c6e485738b/85711584003.pdfIn PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/xigoxawaxutufutapo.pdfIn PDF document text
    • http://mocphatreal.com/assets/images/ckfinder/files/todewemomepatux.pdfIn PDF document text
    • http://klinok-saintp.ru/files/67988939142.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/8640155537.pdfIn PDF document text
    • https://eclearusa.com/images/file/bexatutazozazovi.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/68175186471.pdfIn PDF document text
    • https://vitanov.rs/files/zuvakasup.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/60783930008.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/vowafotodiwe.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/91181325113.pdfIn PDF document text
    • http://manu-transport.com/documents/file/jipobisape.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/00e8119c81e3b9a5a046a1abd7210a69/95037703940.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/71169930706.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jexesenadogopulupid.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/tegakeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=one+side+of+back+of+tongue+hurtsPDF 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_off0000b271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB271 11064 bytes
SHA-256: c51174c6caaee227fb233353f8b7fa4c0a395149ca49d6b3e32e835d3b4a4b1a
font_01_sfnt_off0000cc0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0A 16044 bytes
SHA-256: 3c98e7309c7ed474d1142cdf5964a40996095139b8b930aeee03b7345c0c6e46
font_02_sfnt_off0000f50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1