Malicious PDF — malware analysis report

Static analysis result for SHA-256 65a2f6dffd49473c…

MALICIOUS

PDF

97.2 KB Created: 2021-07-18 11:22:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 597f68fb0c3f2242b46914667c861e69 SHA-1: 9ca7fa31a74ad32ac0fac861d5fafb648d9767cf SHA-256: 65a2f6dffd49473c4c68cf5e6fb407f891b1e51dc4299b6b59b4306dd9a9e67d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites. These links are likely used to distribute further malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f30c8023e1a---xariwaweromeme.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756b88c6ba0---lujaguzesafolajatijuwe.pdf
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/24004610a38c924fdcd0c943f6349f93/29545372369.pdf
    • https://sedefartphotography.com/resimler/files/27827335383.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/2c6e2c917c2221131aef450d01be8416/14966734750.pdf
    • http://taskentcompany.com/userfiles/file/nazuzemezevuf.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/beab4074e5e2ca8ff18fd3414152bed0/25290367249.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a102cabdbd---gomux.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b97214821ee---dagunotovivusojogotomuki.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e8aea3bc9---98497976432.pdf
    • http://www.chatanakonci.cz/userfiles/file/24021593848.pdf
    • http://mlsconsulting.net/cms/files/File/tiwedemisola.pdf
    • https://locoffice.ru/userfiles/file/66952799604.pdf
    • https://ropaalmayoreo.com/images/userfiles/file/81960376299.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a011c09c2fc---48803217632.pdf
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/3a678e31fac422fa9e711d23ccae4ec8/juwotil.pdf
    • http://efuturesthai.com/uploads/file/37701193421.pdf
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/5935d64f83603dda8fd602cb443c262e/68440414432.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831011f1928---37974309761.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d6d80dcb7---64042738834.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b98b82653---kewosiranifepined.pdf
    • http://bonapartefamilynetwork.com/clients/7/7d/7d081654635712149502d88e72c54c2d/File/vokilesawa.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/0e43f1e422c84665fd96e63627c87dfa/85072031711.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=of+plymouth+plantation+pdf+answers
    • 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_off000117f9.bin
6f08ec23850560380806cdd4445d1c8cb7ce75c164daa64cad0d99ba76b046a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x117F9 17548 bytes
font_01_sfnt_off000145c9.bin
9f65804f66e4c72c2ea87057c178183167df32bc67a8dfd60522bd03c4ed7c39
pdf-font-stream PDF embedded font (sfnt) at offset 0x145C9 11088 bytes
font_02_sfnt_off00015f8e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15F8E 16792 bytes