Malicious PDF — malware analysis report

Static analysis result for SHA-256 235aa08a2278c4e2…

MALICIOUS

PDF

85.3 KB Created: 2021-07-05 21:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: ea66119e2af70c8eea469d33e62862da SHA-1: 92d71dbca207c2c7b3bb3c89f468c0f56a1207b5 SHA-256: 235aa08a2278c4e2ebc71cc5b80efa1f72a107c0862d306f7c51be09d8110990
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The presence of ClamAV detection and ML classification as malicious, along with heuristics identifying compromised CMS uploads and link farms, strongly suggests a phishing or malware distribution attempt. No scripts were extracted, but the structure and URL analysis are sufficient to infer malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://telechips.com/ckfinder/userfiles/files/94703945695.pdf In PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/97671155644.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f3529e740---227657354.pdfIn PDF document text
    • http://garderoba.sk/images/_file/27819884238.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/74929487055.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/96447277555.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/c6kfjessoahs8lkrbuc3kdeg4n/putupit.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/javiv.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/99f245274d5358b2fce3daa8e453ca08/90396011370.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e010aa25a---3336032237.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/13448660647.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/08f03fa685baa7963e2de48057d0f948/wefowobedogako.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609c70677b877---84725771193.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/59bae30qko24v4blifd9dcr1s5/29828805843.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b82f4f0cc4d---16610208048.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/ed9f301a690f6f3e465ffb161e05256a/kebopono.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wevadogemumeli.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/4870b192b2fbce8a14ad07368467b3a3/mibokozuvubupa.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/niviwubuw.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/350260c0ec910995311c7d25ddf9234a/26573975605.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/e61924c89a40029d8a192d727a6a4f00/digizimemirafegodubenaxuw.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/5ddfd0f2d26e42bf6ea1e2a25a7221f7/28271211678.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/292019422928.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccad61642f---48428913093.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=playboy+free+issuePDF 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_off0000ed45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED45 10360 bytes
SHA-256: 1d39993c46f037ceb0bf0ceddc0f8b54fffb705163386e1a26ae457631099556
font_01_sfnt_off000104d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEB 16732 bytes
SHA-256: 0e194883952a050da82f43f0f2440161ac397864ceb2706bccda7b9de3555dfb

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