Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8e8c94486311788…

MALICIOUS

PDF

110.5 KB Created: 2021-07-01 00:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: e953646c1931904cec942f1b2da0c971 SHA-1: 313718b9d0547cd5b414b059008580f111c0406a SHA-256: b8e8c944863117886d94f56a3ac74d8830ea60d54c52c7f2f36d44eb83b60148
156 Risk Score

Malware Insights

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

The file is a PDF containing a link farm, with numerous URLs pointing to compromised WordPress sites and other disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of distributing links through such means. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/e5ebdd465818d440b9342d9319c4521a/37359260531.pdf In PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c816eb48ed---rutiromozusi.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/bfcbcb32336f5dcb82b141fa7937b7b2/5421100550.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/99516164368.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/gb46cqvgsoq9gin4n28ha026s4/wubozubatomogape.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/cskcpp4s422qujqqkbt5qqt36v/lutixisozogixesegijozi.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/ava4ihusqqobma0sjku8anlve5/wujurenogalipi.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/monelekilimul.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/6b8f1b5dc47b27cd40dc235c15e2699a/zeragone.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c74a5d4679f---73387901712.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/4c0bbf6e57980a1dee9be9358697844d/zigakoj.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607875cec9dd3---11115693548.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/tedasipipejo.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/mavijasezorerigivinodu.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/liwidow.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/67672615075.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/84026076740.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076262677e16---38391643569.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/693f52925ddf60e8c2086e299ac25012/najaneromena.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data//files/kavaviwuwe.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c703fd200e6---vosolesalasazatasudus.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160b9073c7cd00---83639219094.pdfIn PDF document text
    • http://armanetti.com/images/pavepi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=top+grossing+movies+by+yearPDF 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_off00014c90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000164a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164A7 10736 bytes
SHA-256: a578231ee1404873a3a3764a33a64e9537d8068e5ec4623066878fcab49ee362
font_02_sfnt_off00017d19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D19 17668 bytes
SHA-256: 2e1a0170b460c976252cc46a1b3dfce820d99a8ab03bbd70f1b6a03f1e7fd58f

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