Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2e93f6e36319d24…

MALICIOUS

PDF

86.9 KB Created: 2021-08-11 20:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 323616a753ab573a6e2fbb8566549529 SHA-1: 5d5dd79eead025868a73df31fb6f539b7fe0ca9a SHA-256: a2e93f6e36319d24b46b67e4e7acbfacd8f7ee8b921bf79681dcef8ca4827159
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites, identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest an attempt to redirect the user to malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/ojhn3gu96lk3mi97kvti2pqrcv/vunutore.pdf
    • https://pacpartner.net/images_client//imagesfile/tulajolos.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff954b8b0a---47629621794.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dce0f27f7a4---vudijemozibajujenakij.pdf
    • https://muzeumkonstancina.pl/attachments/file/42268216564.pdf
    • http://josephpowellfamilyreunion.com/clients/0/04/04c15d356d3082020e114f8c0300f46e/File/77829105124.pdf
    • http://ambvetsanprospero.eu/userfiles/files/gizupudidepusoj.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160784b6fda6c4---89107945623.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160df27d52c0db---95554524850.pdf
    • https://arrayamed.com/userfiles/file/58289140011.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/3f6a4849673e0a45ddbf68575cbf40bc/kadewebopofidekagukes.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a19b3034b72---75458572623.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/4f799448f45d1ae49d524777ed3be4d0/pelubobaletutalar.pdf
    • http://cpils.com/userfiles/file/15493470545.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/a603534251fb8e2a145a1bd25adaf2c7/11242123713.pdf
    • http://asijskepotraviny.cz/files/file/90857852885.pdf
    • http://apexnepaltravel.com/userfiles/file/91386260020.pdf
    • http://www.tobywells.org/media/fckdir/file/90446119752.pdf
    • http://snft.ro/media/file/77297038447.pdf
    • https://garnet-medical.com/userfiles/files/57148432977.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/8a4b21c3341a5be857a39ace43ef350a/2923274553.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d190c34212---redesisekomuzetosigedas.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bf097d8e6---zeliwatij.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=unaccompanied+javier+zamora+free+pdf
    • 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_off0000f0c5.bin
425f0cb9300729acc531711b87d6e8654a98360b4c199749d11b2bda98ed7627
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C5 10732 bytes
font_01_sfnt_off00010956.bin
02598c0aee21edecacbcc8deace29dfdd82a6782e8ce72d2dc8572a532517bc2
pdf-font-stream PDF embedded font (sfnt) at offset 0x10956 16956 bytes
font_02_sfnt_off0001359c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1359C 16792 bytes