Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8990626e180ce01…

MALICIOUS

PDF

83.9 KB Created: 2021-07-21 12:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c7a5cc0603659ca2035d0b306dab775f SHA-1: 58fcdbc3d31660dc687411f00bf636d04a5f1700 SHA-256: e8990626e180ce013540e67cdaa8c1b59f337f0444bc68d37f06901e0362bd0d
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised websites, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings indicates a tactic to obscure the ultimate destination of the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://area34.info/wp-content/plugins/super-forms/uploads/php/files/5l41foo3mpst4k8g0hg2dli273/nimazamulotigemig.pdf In PDF document text
    • http://centralgiving.com/media/userfiles/file/rageduzep.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4e531efdb8---4974835757.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/d90d1edb9e7ecc8280e0582d7cc1f687/54131796658.pdfIn PDF document text
    • http://hookmyweddingup.net/clients/73542/File/mejopil.pdfIn PDF document text
    • http://jwnorthclassof70reunion.com/clients/c/c6/c6167e942b76adab5863fbee8ae727a7/File/75160304240.pdfIn PDF document text
    • http://esejsc.com/upload/files/23098198882.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/gikazod.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/e38cb68deb2fc1b10a342e8f032838b2/71726126675.pdfIn PDF document text
    • https://wagaskar.com/media/mamidifujivavebezaz.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/gatifijolujuwuron.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef38769b1d---10385816705.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/cdf18cade9cfbec374c82e363f62f43e/80429351329.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/dca4c569f6dd2c29b1faa4a1263b40d8/wumimejujoloz.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/71870886542.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/wixowibupek.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840ebb3c517---13087314425.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160740cd19eb91---bipuniruvatonoxedonugemuv.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/zupudulujimalalajavov.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/e1be0aa8d7a11b623e89baaef597e1d0/gobalisudokadelajarujoze.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a730fd19e22---xokeduzugovotelilititowan.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/woziwibupodajoran.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/d78f377a0eeb305c05f67f89c8e5a307/97345485097.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/xajizamifowuvenugojaz.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/posawijatom.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/gakifun.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16072a3e5df30b---19008527730.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=old+fashioned+fish+and+chipsPDF 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_off0000e4a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A7 17492 bytes
SHA-256: 8f790487cde9d7a853c6496a05ba63daaeac406b3007975cc5e92b558c48b8af
font_01_sfnt_off00011249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11249 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A60 10544 bytes
SHA-256: 6b132a9f85e4a5ed5919762baada344ebb5dc08f3a130a0cbcb5de6ad1d41f71

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