Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6eee42e1d698767…

MALICIOUS

PDF

98.6 KB Created: 2021-06-27 12:53:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 264afbff06246f10cc8456e92e3e602a SHA-1: effc2913c8739e1ef87388570fd91d4b0983ce8f SHA-256: b6eee42e1d698767d596f2bbef4953bcab8f67706907265391f87956b3c1074f
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF appears to function as a link farm, likely to lure users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160994c47380f3---turebedewidivonaw.pdf In PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16199786305373.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/bumiwad.pdfIn PDF document text
    • http://fructusartis.com/i/File/57649821932.pdfIn PDF document text
    • http://michianaorchidsociety.org/clients/2/28/2832e32407c795c8d28ffe68102aa18e/File/655054931.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/6fa512af9b839ca42b5b0305a66e6ce4/resasoxeruxilekojefeb.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/9553932173.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/bojewizepavemapes.pdfIn PDF document text
    • http://www.moyekolodin.com/files/25534471090.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608003df9c246---81353568592.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/cf8adb57d9e3520a97084de385c483a9/susamirijavedezi.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/xetemefogazopawobaxo.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/didowagarito.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/65aec1d617bc9b72e8c02f7fa7eea6ae/vutotuvojefurotuxidetiriv.pdfIn PDF document text
    • https://aashianarealty.com/file/sovotibowusutavezaw.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/d05d49979741099867d3bb7105bfb35c/tofusoz.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/winakalusikexemapafog.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/fixedutekefamisubulo.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/d2733ad03a25254d8850a40c6200dbba/45833248570.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/dc1smfae835pq10vfgfcfjj1qt/87672115903.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2aadde14c---57234905010.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c02f563c6---24115243483.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/zapejexesuraxeze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=harvesting+and+post+harvest+handling+of+cut+and+loose+flowersPDF 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_off00011c72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C72 11140 bytes
SHA-256: 6dfe09130653942fa3795fb0848c9464cdeb4062ff3a4ff0b8df7b5301f0c515
font_01_sfnt_off00013637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13637 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014e49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E49 17848 bytes
SHA-256: db25ef6ef240dae3aeccd1e3f91fdf610f94b22e63da2b5b808d6a7bff9aa49c

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