Malicious PDF — malware analysis report

Static analysis result for SHA-256 09b0490af91b13e5…

MALICIOUS

PDF

76.8 KB Created: 2021-08-28 19:22:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d7e261062d152b39b54d71827ebd0177 SHA-1: e16adc61b9b880a777dc94a28c304780f5aa758e SHA-256: 09b0490af91b13e544c8cc8b68c9959f5d8589ae9e2c105814b1a9202ea9cae7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://laborke.ru/uplcv?utm_term=mangrove+forest+grow+in PDF link annotation
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cdc89083f---zilevanevalekoripipadumu.pdfIn PDF document text
    • http://sunarfactory.com/userfiles/files/kujijesukunetiwa.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b97db4b7c37---32510375412.pdfIn PDF document text
    • http://phubozena.pl/userfiles/file/37889094722.pdfIn PDF document text
    • https://makanbanyak.net/contents//files/valusovulajevonazivubo.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/49155054015.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/tuximekukudaxup.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/52480255948.pdfIn PDF document text
    • https://birudongker.com/contents/files/bokujotekovez.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/jujof.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/lt4205uts40q44ufnuf3nbof01/37506633266.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/wufumorikatabokixilop.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/24mrkl6aertik7eesjtrkhg1j5/morexipun.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/97b144638aeeb63ca1a6ee9846ad94ad/tavezonevato.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/dahq0ekkh53i3htvfo2ronv6e5/60615022203.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16096f7f9c2893---dodesenufezutegaj.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/63677003049.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/nevurisoxebeza.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16108d02e7246b---45584530356.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/solepodifa.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/1b2aab4697dcb85125c6c5ea2ce221ba/97965899502.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/69530842466.pdfIn PDF document text
    • https://atphp.ch/userfiles/file/madebanedavakuvefima.pdfIn PDF document text
    • 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_off0000c847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC847 10488 bytes
SHA-256: fcb6476486f19caf348e2d6a36b40da7f23e5c022127273895e864db15c03946
font_01_sfnt_off0000e056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE056 17228 bytes
SHA-256: 27e4fc3346821d8b9c14db4536ed69d46da24fce508e7dfe5a4385d58680a3c1
font_02_sfnt_off00010b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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