Malicious PDF — malware analysis report

Static analysis result for SHA-256 d98d6e612924d52a…

MALICIOUS

PDF

85.9 KB Created: 2021-07-05 17:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f3473f54db8e91ce6b2d1b8fc8fd450 SHA-1: 7eaa618223e8dfbd0e1c861d6e4e9e3141ba1c59 SHA-256: d98d6e612924d52a79f9ab9bae5e5ce6fa64f3cc6c8044d7c170a508b2feb764
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised WordPress upload directories and other potentially malicious sites. The PDF structure itself is indicative of a link farm designed to redirect users, likely as part of a phishing or malware distribution campaign.

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://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7176f1828---xolijuxoga.pdf
    • http://permianhighschool1970.com/clients/e/ef/efee9fcbc667252fc4b649c8163d3733/File/61313903819.pdf
    • https://fullmagicweekend.com/ckfinder/userfiles/files/54874893819.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160872b6acd37f---96719986054.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d44b98a814a---juvebavizalafeniwo.pdf
    • http://shopexpert.com/app/webroot/files/userfiles/files/punawimasafevupuw.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/c3d48eb2c9b43cb6c38408a277b36b27/43385296607.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8586aa2d12---92428996740.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/f7345575ec9cd68c1e40baba0f1cddda/dufidopozusakixilune.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2ff8319dd---rekifusoxefarawub.pdf
    • https://apskarota.org/userfiles/file/65601374626.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/u7havgs3vd98hn0sfa4esl0rga/marorinixenasuguxibubudu.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/c75297cf8ecca64236d6a5b38071bcce/93022104913.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160784668b4c5a---82056913998.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a5cdc9e8f---38164726427.pdf
    • https://juhaszautovill.hu/userfiles/file/20344436383.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/7f911e341a9dd2a97dd2b48a6d2296ae/24234715659.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/5190d9d9132cf926770dfa76178484b6/wufomonegel.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c55d7be54---ledivulimubuwajirelokod.pdf
    • http://abovomedia.hu/_user/file/25489487237.pdf
    • http://unseretochter.com/images/file/sebavetidabuwanan.pdf
    • http://charivne.info/images/file/sitirapewuso.pdf
    • https://clickkedai.com/userfiles/file/sivovalilonajenesure.pdf
    • https://karinbentum.nl/uploads/file/mojudekusuguxofedujasudov.pdf
    • http://danieldesignpro.com/userfiles/96139792203.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=bati+without+oven
    • 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_off0000f005.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF005 16792 bytes
font_01_sfnt_off00010817.bin
288b23499e8ef9ca8c32fab8c035e707c6e4c3a875670ba38473540f38f4dc32
pdf-font-stream PDF embedded font (sfnt) at offset 0x10817 16816 bytes
font_02_sfnt_off000133a8.bin
e04f96d300a289a3b88cf78adbdcbb503dee4a10cef764c13cff988dbaae3d09
pdf-font-stream PDF embedded font (sfnt) at offset 0x133A8 10196 bytes