Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c8a0196450b6b12…

MALICIOUS

PDF

89.9 KB Created: 2021-09-01 22:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3c02947a10e0f0a84a8c473fdb371dd6 SHA-1: 6c915f65dd96b9ecb708737f5f440818a1cda532 SHA-256: 8c8a0196450b6b126c423739a89440cc6a3458f82d7ffe19f9ee2773fa40b13b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites. This suggests the document is designed to act as a link farm, potentially for phishing or to distribute further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://etenindex.nl/images/uploads/54368659220.pdf In PDF document text
    • http://raczcsalad.hu/files/jowomelogutenemog.pdfIn PDF document text
    • https://www.foundationofhope.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082d803a0bf8---5563473512.pdfIn PDF document text
    • http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/30241172985.pdfIn PDF document text
    • https://upaspor.com/resimler/files/bawof.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/pevefuwovonujotugofe.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/noruv.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/8bb6d10b9615a40fc4bd57907e2d398e/bivupi.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160b45578aa3b4---gupuwataji.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b8f0ba9825---milofubexog.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/labub.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///77316385748.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/88278556460.pdfIn PDF document text
    • http://termocity.by/pics/files/41102029792.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/mawuxisujefipemapeto.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16086e7b875b76---ximijebiwozorijolarufabam.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d25a23674---mukuvarevegi.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/kv0kptk8t8pnrub6tej5e1n533/vobeb.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612685f62a83a---matodizewuzinatodor.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/guwomigemubef.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/wawusixoxavovijewofej.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/denipimuvizazivo.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/1ovlge2tu6ukg8qi4f88u27fkd/kiwajowori.pdfIn PDF document text
    • http://ingore.cn/upload/files/limum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=advantages+and+disadvantages+of+manual+payroll+systemPDF 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_off0000f940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF940 17696 bytes
SHA-256: 4a9a2a24b7bbb3d96d48165e5ccd8e3bb5372f4475915b256163ce7b28954579
font_01_sfnt_off00012730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12730 11104 bytes
SHA-256: 432bbf43b5957843154773a477d140cef29b5712e68d0da7f297409aee7713b4
font_02_sfnt_off000140f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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