Malicious PDF — malware analysis report

Static analysis result for SHA-256 886b8efa1801fcdf…

MALICIOUS

PDF

84.1 KB Created: 2021-07-08 12:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 66c80209b29642bc9d0eb7a1e6db95b4 SHA-1: 464e10389763a68acca6b0065152ddd942bbcd09 SHA-256: 886b8efa1801fcdf38de1870dd0dea83f346351f711baeea3a1d7fdcfaf8d874
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, likely serving as a distribution point for further malicious payloads. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b4a5db407---lojiz.pdf In PDF document text
    • http://meadescafe.com/userfiles/file/79684420941.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/4e095ed717d75281279654b92f9513c4/raxetizenalemoxazefenafax.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/ojr4jb12tms711998ku75nha24/94737810395.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/22840d1b1cbaa2ffdd1cacd06350349f/dulavix.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/dagede.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/14785471289.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/wejumawogipufe.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/kimitekovadifaramarolurel.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/8ik2cg2546hq1l9ccgn3j06kqh/niwabodiwizuso.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/belozuwagisoti.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6d8343de6---12463774294.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/varavepusededenapuxa.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/34407312989.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/nasiwukisomafilupe.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c04020e8451---59235991420.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16093467548834---19906337809.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/xebazupawigujewodijej.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/levifubo.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/56188421545.pdfIn PDF document text
    • http://namlongprojects.com/images/uploads/files/93669966805.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=angiotensin+1+functionPDF 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_off0000e793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE793 16912 bytes
SHA-256: 65d3fa0dbb9da64827d17c54bcdedecbb08c67a5b39c9a7184bec6dcf174c709
font_01_sfnt_off000113b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B5 10336 bytes
SHA-256: f524a83b0e9cba27b24c05acad05ff6b53807279b4d7ae61c001405897d491d8
font_02_sfnt_off00012b4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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