Malicious PDF — malware analysis report

Static analysis result for SHA-256 a79751efa024f0d2…

MALICIOUS

PDF

82.1 KB Created: 2021-09-08 03:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4ba36288e179fabb7fd7bffab2356fba SHA-1: ce4985849b6312917c6563e880a2625f5dcfc9af SHA-256: a79751efa024f0d2e1856fca2c0fde0cbd003a6330cdd97cb1214be3e7309a56
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is unreadable, but the presence of link farms and the overall detection profile indicate a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b44b31483---wipewafivimajuxebidureka.pdf In PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/tidugatabune.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/6c8abedbef71db40e46cfb3760206577/28418240326.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/jufidixux.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/e29cfd834231b591974c7352037e232c/talugir.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/82998177669.pdfIn PDF document text
    • http://christopherdallo.com/file/42604470242.pdfIn PDF document text
    • http://forresterfamilyreunion.com/clients/c/cc/cc72bfd2512333311cc1ef5a4fdef90f/File/faxixalewokitodaxof.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/42210097118.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f9739391f---79854774182.pdfIn PDF document text
    • http://planetamama.ru/files/file/fafubivifotilumosiv.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/fupozureb.pdfIn PDF document text
    • https://blugarden.eu/file/66440341122.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b74d26a2f1---6512827479.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/4736461450045de4f8134b98fc3d3315/96628456761.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/kamafezalarida.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/tevusor.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/xadelulixegilu.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/24610711151.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/dl324oqb48f9b7g2ktshc2cer6/zegoferawirubedajoje.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be8b1ba08f9---43453447092.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/dazufudodipebatubure.pdfIn PDF document text
    • https://people11people.gr/uploads/File/13941069574.pdfIn PDF document text
    • http://4bx.pl/public/file/29881043218.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/50769208430.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=printable+graph+paper+1%2F4+inch+pdfPDF 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_off0000dc2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF443 10916 bytes
SHA-256: 601bec728d634223b2c3b2f5ae486902265213c2cf395a89c1489f0e1269e2b5
font_02_sfnt_off00010d1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1B 17360 bytes
SHA-256: 703e9f119df1c656b06904248cfbaae989230a839d0bab3ff64b4c79136ce0b2

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