Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ba782a489e23e3…

MALICIOUS

PDF

71.5 KB Created: 2021-09-01 20:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 005e3b922357dca3357bb586a20e3627 SHA-1: 29bf175a4e9d9be6aa112dadc14d487cb6f60cc6 SHA-256: 81ba782a489e23e362ca4e48054550e31cbd8a7793909e5076c8e7158800c2c2
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites. These links likely serve as lures to direct users to malicious content or phishing pages. No scripts were extracted, and the document body was unreadable, but the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/dad422df30963103cd1c60bae151aabe/novutejetugigot.pdf In PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/1d7f228f3b2ffe418be55ac3d4fdc415/monewerawimuronuforam.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/dosoxabebizi.pdfIn PDF document text
    • http://touchpanelpro.com/upload/files/siviregakoduwakofirazana.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/fadisidokuxobarumobe.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/2974fcf380c811c985ae6fbc82fc2d2d/75170272444.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/lubijubom.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/butufudunirifesefe.pdfIn PDF document text
    • http://fabtur.ru/upload/files/zelara.pdfIn PDF document text
    • http://dnepropress.net/files/file/lukojumigomiziba.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160984fa7c0801---rejatuxataluwazo.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/rizakenuro.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/98113816340.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/41d87d43a571a06094d2839f9185d07c/vifojobafovinuvajix.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160fb088c89d72---56642715276.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/5971e813a439f07fc6b550466ac6e703/mazoxubu.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/97326862830.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160accdb02a93e---28473204056.pdfIn PDF document text
    • https://loctra.net/userfiles/file/98072811801.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607c09e7add51---26712239955.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1608adfb2b1ed9---subebiroditegesuwawajiku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=find+the+sum+of+the+infinite+series+calculatorPDF 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_off0000b521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB521 16116 bytes
SHA-256: 1eb68d8f1e0ace4bb3d977f04f339fc5f5c1be3afb892ccc1a48dfaf8e1e2d51
font_01_sfnt_off0000df0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0A 10820 bytes
SHA-256: 0ab355a706d48b112b1246f9d1d10e724fb36f514382e00e376c7bcdbf06e9ae
font_02_sfnt_off0000f7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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