Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f87a85c44c5c7de…

MALICIOUS

PDF

88.2 KB Created: 2021-07-07 22:36:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 42b3cbd2edd55b498eaa84914193bbef SHA-1: 4c425c266474a41043d27b553f5257e4a57f4288 SHA-256: 7f87a85c44c5c7dee887775383949b2dd5f6b9124b0b781a4243fbab3da0511b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress upload directories, suggesting a distribution mechanism for further payloads. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://tepihtrava.rs//files/6746423054.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8a9febdca---40507424427.pdf
    • http://notarbrazda.cz/userfiles/file/33278271372.pdf
    • https://ludifrance.fr/userfiles/file/wusokega.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab68eaf1561---65506690587.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/4s33kqildltankrm7676t3qm3o/10445893137.pdf
    • http://studiomistretta.com/userfiles/files/30674651633.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/52b1f8445f89b95405d6330c523858c5/damidonajutodukafevi.pdf
    • http://amadpich.com/userfiles/file/92715184548.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607011adddb5d---37587367937.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/gau3i1eiuc2nrs7uqc9ftfaumc/66240911630.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/b3c9630b1422db2b299c6472e2246d1f/bozorevedirunotafujus.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac80b8dd124---2915317273.pdf
    • https://seitonsolutions.com/ci/files/29911217461.pdf
    • http://ajivikafinance.com/userfiles/file/terufudumovir.pdf
    • http://ruishikaishi.com/upload/content/files/2021/06/20210620225157.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092ee0de486d---38488905458.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/5e3c6686a4b5b40b44b73ad293026ed3/72175059081.pdf
    • https://contabil-fiscal.ro/mm/file/55545853853.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816cd11d3e0---xixipem.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/edfa747013f797c4fb1c24dee8096fd5/22379219645.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b759aedb4d5---79674683724.pdf
    • http://niezapominajkowo.eu/userfiles/file/bogarawupemir.pdf
    • http://21cedu.com/pds/userfiles/files/87704545937.pdf
    • http://portalpr-b2b.es/img/user///file/_0358563001625538679.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7cd52a89e---mejakuzebaj.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=dog+movies+tamil+dubbed+download
    • 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_off0000f633.bin
da17397121ed6070f5912c73af8f94c512ab55b55eb03e9e1f93634a556912f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF633 16948 bytes
font_01_sfnt_off0001225a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1225A 16792 bytes
font_02_sfnt_off00013a71.bin
39cd7472fb789fc8376767f8ac32fb8acbb486ac02ce588598a75eb1376eb56e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A71 10884 bytes

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