Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d5f32513d8b529e…

MALICIOUS

PDF

76.0 KB Created: 2021-09-07 04:33:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d2bd42dbec0cc038e75cd16e39080f6a SHA-1: 2cda5507449c58a569ce3264b2d9d0c022a19805 SHA-256: 3d5f32513d8b529e2200e724e168dd76a6275c540cef169b1df4e6a9cd888314
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings supports this, suggesting an attempt to distribute malicious content or phishing lures through these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0c55d07aa---59391578087.pdf In PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/143b18c8620fdc7729264c6bc844bd14/tixepugujedelazebodewaweg.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/72205972137.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/4b317108cf91d57911db8a4f829c9a4b/ladez.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/sqe5j741fatmp2vrtpv72o85j9/dojewenuwafosegaduwoxijid.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa//files/walusamenub.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/zuxosikofave.pdfIn PDF document text
    • http://school15-tyumen.ru/f/kasobijew.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606d628376511---betapewuwegedemade.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/8806445e42ce6d0297159ce3ae4d5ec9/62329674896.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/83302318032.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/40476124932.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/33503345172.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/59700631720.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/28757832952.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/15611821675.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7378ec6c21---jufibiragewe.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/75288626220.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee34a54700---88212209623.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119f82e3ff64---77100497528.pdfIn PDF document text
    • http://bomtvplus.com/data/board/file/20210609191229.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/9bjf7v0qkr02kolpgoj086mv0h/kewizawipiz.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/fodekowage.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/29420139830.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=domino+jessie+j+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_off0000bedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEDD 20000 bytes
SHA-256: 4aa9782dd6c3d959644964f88d0bafeb5436b9f80ff9df1a45b3c9ce70ef6029
font_01_sfnt_off0000f333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF333 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4A 10384 bytes
SHA-256: cffbe1c06effd90ba9c29a5b36ca3330f9e4b5f5b7f1de1081b20bdc436a02be

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