Malicious PDF — malware analysis report

Static analysis result for SHA-256 05c208db78308286…

MALICIOUS

PDF

85.1 KB Created: 2021-08-20 08:33:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a105bf7f333b2e46aeeb84a2ac4c2423 SHA-1: d7ba96faa8b54d684f537ce64a8afd95857216f5 SHA-256: 05c208db78308286371bc3f8e4f9d4075a4de613c417c5310aaedf5464465bcb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs hosted on potentially compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely leveraging embedded JavaScript for redirection or further exploitation.

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 https://jmtours.co/aym_image/files/65130139074.pdf
    • https://gemwares.com/userfiles/file/renaxoredatoruvifakadib.pdf
    • https://macroedunet.com/userfiles/file/lazowiwesexi.pdf
    • https://sreekanakananda.com/ckfinder/userfiles/files/nixapidewos.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/9b758b65068770d0128c936d51289bc1/17852629012.pdf
    • http://t-p-fortune.com/userfiles/file/698381372.pdf
    • http://carbontuning.ru/file/29798452620.pdf
    • http://womenscouncildallasarboretum.org/clients/85748/File/92318836083.pdf
    • https://nguoixunghekiev.vn/userfiles/file/nokuretixabevudimu.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb80b69027b---xulemifokisurulefom.pdf
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/2c20327e20e8d72d8d5b24c6b01ad4d5/7408989837.pdf
    • https://piauiaqui.com/ckfinder/files/33833469073.pdf
    • http://ckpak.com/fckeditor/userfiles/file/sababujogunozekudup.pdf
    • http://hantechwelding.com/userfiles/file/2021081319524473499.pdf
    • https://bdaudit.ro/userfiles/file/13221868278.pdf
    • http://reanda.com/jingkelun/userfiles/files/20210608192740.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/cruahr3sdaupf439mbf948pvg4/regodevanezalanexo.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/dfj18dcr1p9s2ea2ba5hle4sk6/vefibebosulo.pdf
    • https://soechi.com/userfiles/file/38950925193.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071917cccc0f---fowibasamu.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6bd3710b64---vumewafisupogagew.pdf
    • https://sailstudy.in/ckfinder/userfiles/files/nunojigamevapefutizivusa.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=articulos+definidos+e+indefinidos+en+frances+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_off0000e438.bin
0ffdabfe031a1f91b0e1b6279515b7843cf486dd0e081a2cc527505c5917fcd2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE438 18592 bytes
font_01_sfnt_off00011314.bin
df839509b83430f33c170333db5a9715a9f807882179d0b0f263cc9ca1a1ee9b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11314 10692 bytes
font_02_sfnt_off00012bc3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC3 16792 bytes