Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9cdf613303f41fb…

MALICIOUS

PDF

89.1 KB Created: 2021-09-16 01:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 86e0879c641ef3aa3f04b840b39a89bd SHA-1: 5e896f43bdc775a8c57d3ea1feacc03265667280 SHA-256: e9cdf613303f41fb09ba5c5735f620f7662d23934b7fe4bb76192db10ee12bcc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable or compromised domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://crysiq.ru/uplcv?utm_term=watch+black+hawk+down+movie+online+free PDF link annotation
    • http://zkojicin.cz/userfiles/file/xurenamunetefowafisabe.pdfIn PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/sumodugexanobomakufemi.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/11627808151.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/bewijo.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/vifuzutiwajozarotaw.pdfIn PDF document text
    • https://hoangmailogistics.com/asset/site/files/bujoxekupapefakari.pdfIn PDF document text
    • http://citty.org/images/uploads/file/18146702274.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/35866388759.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b2d0209e2---44586089737.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/14626619361.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/72165386719.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/43239881596.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/kukoxotavegopejakuf.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131787777724---43250498780.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/lupedipotatalonus.pdfIn PDF document text
    • http://rc-modeller.se/images/file///xuxokezudugaju.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/mujilurepe.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/kikagi.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/gowekaditiregesusojadeja.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/xusulevawudijobegazowofik.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/64eac439c26442efc792f6858cc6b27f/kasijalu.pdfIn PDF document text
    • https://angkalaris.com/contents/files/nutigaluvobavo.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/fd71888bc6341fc59686763bf79e02c6/87552709612.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/09a88d89f9975fd6ae5d384ac2be1cfd/xobezozukupiv.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/46975166196.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/95425747030.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_off0000f874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF874 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001108b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108B 10952 bytes
SHA-256: 0b2d89964b1e3ebf704b2fdb4d54504197141b567eff767c831f5ed018efd0c0
font_02_sfnt_off000129be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129BE 17596 bytes
SHA-256: 365a464e6e61aa44306803f0d44eb57b5557e3da4133dc3fe9965d4ca6983a1b

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