Malicious PDF — malware analysis report

Static analysis result for SHA-256 6eae7a6a0ce2ff60…

MALICIOUS

PDF

88.8 KB Created: 2021-08-11 21:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 06709893b41e2f5af09ffd3aa64931e4 SHA-1: 0651776f21f7652e500fcc048f0dcb6d4bb78d60 SHA-256: 6eae7a6a0ce2ff601048fd5e9126ca5341fe956a8aece468ffc8e6b0003d3160
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, likely to lure users into downloading malware or visiting phishing pages. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://smidgel.ru/uplcv?utm_term=corel+draw+x7+free+download+offline+installer+filehippo PDF link annotation
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4b0123123---livelupog.pdfIn PDF document text
    • http://video-cycling.de/files/file/11076228620.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b112bb1719c---99750165127.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/sukebenizumapigixusenekaz.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab2ca87f31---tinewebapufoli.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/javeletimilewabodi.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/22474186133.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/sofomef.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/bavelowinibobevusur.pdfIn PDF document text
    • http://www.klccpa.com/userfiles/file/In PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/17736813581.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103a5d30fa4e---xiburuberaxuk.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/9e1407583f33906a37afdf794ffa6559/51852255723.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/68261dbadd8d79f75cf413767c54e782/40827445457.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/bidigevipodewavuwowinomud.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b78d1a53024---bakojepad.pdfIn PDF document text
    • http://chineseclothingonline.net/File/liladapugixojewokojojil.pdfIn PDF document text
    • http://moristas.com/userfiles/files/32183436000.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/kimelemovoxekiwezokovikil.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/244c8a7a8870a22c939ede56565c4fc8/kulubureselupeposaselop.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/vkk6if2d7iesa9ius7q6pu4dm1/67956281905.pdfIn PDF document text
    • https://fishuntpesca.it/file/65053747267.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/70377528378.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/50083220009.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/91054652375.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/lanimamisevabaz.pdfIn PDF document text
    • 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_off0000f792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF792 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA9 10864 bytes
SHA-256: 02a6795175760b826b1e39f9277ee5cc2385f9af48d639ec455be951c6cc6a88
font_02_sfnt_off000128d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D9 16712 bytes
SHA-256: 6d4a49aeb72b15434190970c78df186c26cfe5ed7e218fc69a6135d54b44611a