Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8be4562b3f845fc…

MALICIOUS

PDF

83.3 KB Created: 2021-08-01 02:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8bb0f84daf5346b147fb711975e6bbfe SHA-1: 844e0683bdae30f62f013bfdf010cf77150c05ad SHA-256: b8be4562b3f845fccdc7bebbc7171e85a3ae55658a2972e808bbfbbfdac0f43a
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The document body is heavily obfuscated and unreadable, suggesting it's designed to hide its true purpose, which is likely to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://altinay-law.com/images/file/vewepupexipomiwomilid.pdf In PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/bejosijutumivipevuradil.pdfIn PDF document text
    • https://invest.pl/userfiles/file/11632873992.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/f9d75e0dd8b15e38431be55e229fa052/39423346033.pdfIn PDF document text
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/nerudupodidumizuxuv.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b8bdc11d4---tajisudixapetoxovejer.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcce7a8c7ac---67849616081.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c4aee2e05---xokulabiletuxalaw.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/tegilisijefusifim.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/wagoxa.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/sofimudavirotedozug.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/tikodukavugofimasel.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16095cd3922383---22813028444.pdfIn PDF document text
    • http://wych123.com/upload/files/pikoxorekugomiluvu.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/ooojq5ci1sgr4roppe1a9ruh2r/93749283705.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/fafoj.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/mojejuvebubasonekemisoga.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/1833546550.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/garoparivuxukavuduvavu.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf68f1f039---lazejezidesosudorupo.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/melufuvi.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/toworatiriwowosovaduduze.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/153ded78f1f179f91bdf779b7a8c2e69/76653057553.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/12651363813.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/4a6e99a4c8639be7f4e32846f35b97cc/33805590194.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=will+exercises+with+answersPDF 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_off0000e52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52E 10388 bytes
SHA-256: 853d2d58e755f08a148f9a85df54e8089bb646ef2d4cc684e7ac9583aa3a7631
font_01_sfnt_off0000fcad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAD 16616 bytes
SHA-256: 0efbf0f3c88a6db9c10fa8aae1b774ec985b61dd3275a684b070c21cde2f7154
font_02_sfnt_off00012785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12785 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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