Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3c4b4bcca8866bd…

MALICIOUS

PDF

83.2 KB Created: 2021-06-25 15:09:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f3d105a47dd6fb291df4c36dbd289d76 SHA-1: 299832ddd8001b8c4759c60a8ca7b9d1fd05f1e7 SHA-256: a3c4b4bcca8866bdf88347339831b1754776d5e51d4855a9f9b730b92ee6537f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous links to compromised WordPress sites, likely intended to lure users to phishing pages or download further malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the final destination and potentially leverage SEO tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/41cc5b073258ff83a338120e1d621ac5/sogavuze.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/1d951a4f5befb2fa28a6a9d728a49614/42783357007.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160b5533ddc12a---getoxuwotevutixitapisow.pdf
    • https://jf-orvalho.pt/userfiles/file/73618650976.pdf
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/bcc78f829427e632eb723a77f623dbb2/6173300907.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/1f6d9dd6b9a40f32bb0cad44153ab24e/37630733066.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/dc4048fe26cbf47d91251b0471d414c4/maxadumefiwarakumumozo.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/8f5f86b061dee0a3599bd0912fdc2dfe/piripe.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/44da08ec2153b9a6894fd77987ccea66/34501677054.pdf
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ffa8e9986---firus.pdf
    • http://zrdb-drogbud.pl/Upload/file/28646645164.pdf
    • https://holocaustresearch.pl/nowy/photo/file/tosogisevi.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca8269f8bd---doduponozigu.pdf
    • http://bi-acaovo.com/upload/files/22469850430.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=lump+under+right+ear+on+neck
    • 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_off0000e3e9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E9 16792 bytes
font_01_sfnt_off0000fc00.bin
0fc4d2c6088ee685934b068f0418a07b4359b0934fb6e57b3d3251e60d26c1e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC00 10896 bytes
font_02_sfnt_off000114c1.bin
2b99f8472b254ac2d12120cc9d5547eaf521220e808a705557b37f7cd6867baf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114C1 16728 bytes

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