Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab1ac92c0f13d3ea…

MALICIOUS

PDF

90.7 KB Created: 2021-08-11 19:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 41c1dffc0871bc543e7e9f0cebc57d9f SHA-1: 550d764c374d214711cf237a6cd5c8212ea004aa SHA-256: ab1ac92c0f13d3eaf0755734f66f3cd861590dc7fae9c3625e8d5944ebe71f8d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to websites hosted on compromised WordPress installations or other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The document's structure as a link farm suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://teledirk.com/d/files/83811512294.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607982ba84433---zalofusezur.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/d35845f5c1d04745680f102e32c1a36c/69634920260.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf3bb1679d---wotolopedigazu.pdf
    • http://homespakistan.net/magzine/uploadfiles/file/majizafopofubage.pdf
    • https://mmagame.com/userfiles/file/salarugatajapubunotir.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/1efecf0917edc27cc5fb67ab4128ede2/71188286216.pdf
    • http://simonide.org/userfiles/file/fibewudonux.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/c42d66573b7a09cb3233d70f4b5f4f09/79998070322.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/0257d9d83119455401527a19e717dba8/joguzenumidepokogetaw.pdf
    • http://annassteen.com/ckfinder/userfiles/files/xipafak.pdf
    • http://dietaltop.com/userfiles/files/kapajer.pdf
    • https://bookatowncar.com/userfiles/file/zanovizageta.pdf
    • http://auksozvynas.lt/userfiles/file/xufizatamefovopuxitutaxi.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a42f2d95db---48990277984.pdf
    • https://bbpartner.cz/userfiles/file/ruvedibegezurasapudevuf.pdf
    • http://www.ecostroyservis.ru/File/wixakaxufexafuwutogo.pdf
    • http://al-bandak.com/userfiles/file/31334578279.pdf
    • https://jodhpurtravels.com/nbloom/fckuploads/file/sirukuxizamenorolex.pdf
    • http://ezibra.pl/upload//file/5607306224.pdf
    • http://rambud.pl/uploaded/file/ruserigazufopu.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f0756dd3e---wumakesidovodivo.pdf
    • https://landtop.com/filespath/files/20210807135808.pdf
    • https://diedacorporation.net/freesiafiles/file/37676556736.pdf
    • http://adveotec.com/img/file/39850229560.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=free+printable+brain+teasers+for+adults+with+answers
    • 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_off0000fc67.bin
18a8b23892c10d4da70d383d6c52940cff606f69dd1154f91d72d7a4ab2bc93a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC67 17684 bytes
font_01_sfnt_off00012a8e.bin
345923e4d33f21d9cb6027b37a8b2518c2f71f1c432ffc8cf8a8c1237f57213a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8E 10896 bytes
font_02_sfnt_off0001437f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1437F 16792 bytes