Malicious PDF — malware analysis report

Static analysis result for SHA-256 51caca05cc209bc1…

MALICIOUS

PDF

77.3 KB Created: 2021-09-08 01:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 07bc7bdbe2f598e607b63f0ccc346ee4 SHA-1: b1a19eb35f27d9d08f1f6b18ee4fd27105396a38 SHA-256: 51caca05cc209bc1568e09bfec2e0f9e902de5736fe7933d4a387b0a0ca2b431
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file functions as a link farm, containing numerous URLs that point to compromised WordPress sites, suggesting an attempt to lure users to malicious content or phishing pages. No scripts were extracted, and the document body was unreadable, but the presence of many links to potentially compromised domains strongly indicates a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/61570d5191791c4922ada43ea85d2d66/66285881437.pdf In PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b841f75e6d7---vadavow.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160798220f1e77---vofiwadusitex.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f47081d4f62---rowiji.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/kv74cp2ef1e3lj2fecnsnk00ai/xudelukurinodikalus.pdfIn PDF document text
    • http://bjallstar.com/upload/file/93530556744.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library//File/14633803646.pdfIn PDF document text
    • http://infas.cz/images/wiswig/file/wuboz.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/dedibimitosavikukup.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/15438888741.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/7ad8f4d2a3dbf5338b8f021dbd986a9a/94590417137.pdfIn PDF document text
    • https://giyimkent.formenemlak.com/upload/ckfinder/files/rogusuveg.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/11883231206.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/fubezedagugomilikaxim.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/23831690676.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/a1c09770c90be96948e7982ff545269e/67357392096.pdfIn PDF document text
    • http://ms-domino.eu/images/file/files/piralazebesux.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/40646392981.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/21b7205f00dc39e8cc86a756a2bbd213/giranojuromijatodewuda.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/22846321346.pdfIn PDF document text
    • http://majedalkarkhi.com/pics/file/toxawujeliboloxe.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/57454389176.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/nunejakuxivin.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/57643278590.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/95094211847.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/jonigowelavawerimu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=proficiency+masterclass+pdf+vkPDF 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_off0000c338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC338 19796 bytes
SHA-256: eee1022cd34a42880b05810bfeca1cf831941593759682e848cbc21b75f327eb
font_01_sfnt_off0000f5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDB 11056 bytes
SHA-256: ba1db537140279930f064ce630c2715e932d7600125ddd16c4ef6d066947fa36

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