Malicious PDF — malware analysis report

Static analysis result for SHA-256 44f3cc1bf6f9ab6d…

MALICIOUS

PDF

78.5 KB Created: 2021-09-06 16:29:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4970940f4d75c655fad1a774ab5950f9 SHA-1: 1494ef25dc77a838d96b0a152b83b46464280d62 SHA-256: 44f3cc1bf6f9ab6deedcd3fa9bc6c024ac826940e0f399cf7c9d298f57ac3777
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such sites for SEO manipulation or to host malicious content, and the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests links to compromised WordPress installations. The presence of multiple distinct hosts and the use of UTM parameters further support the interpretation of this file as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://biovuspharma.net/userfiles/files/mexakemuxozule.pdf In PDF document text
    • http://lamexmarket.com/uploads/files/32323679607.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/79b7120a45e184b827e006b9424b0553/xinojoxeta.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/vasolulukewemumefozefoba.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/gokowipomojibutuxikenu.pdfIn PDF document text
    • https://umartravel.com/files/misubilirerekelajulili.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210801160820.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-5/20210505041200392020.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609edeee4c831---tezaxumekom.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c2de4abf3---noferodujuzo.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/11570715365.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/setunifujafasuxe.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/fizomokomu.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site//site/data/files/lolugozemegonoja.pdfIn PDF document text
    • http://maihome.hu/admin1/file/xafaxalufutaxobiw.pdfIn PDF document text
    • http://camptagola.com/clients/66689/File/lidakojevedezawixuwijavuf.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/torokofitelilab.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/zijaxedugusilare.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/vutes.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160778eec932ed---xuwinunuwago.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756eadd03f1---tojibewipidesuzaxe.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/35078392471.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/gavowubiner.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/ef34a01aa851befa4f09defafabb9734/tenafowuzoxox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=diplomacy+and+statecraft+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_off0000cb7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7D 18244 bytes
SHA-256: 2d530a796a7228c3e5c6093a35976806014099771a1061c1d779c2300f6f2f63
font_01_sfnt_off0000fad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E7 10896 bytes
SHA-256: 7b99b8aaf51d383ee5bfb5990a0880610b5e1a08c70f08d9e52725724ea33b16

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