Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0ec8941e410e106…

MALICIOUS

PDF

81.3 KB Created: 2021-09-02 07:18:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c1248922d9b6eb50852d2f95650a4d5f SHA-1: c3560c11b15c3ad77cdaca77f5b00596e588e153 SHA-256: f0ec8941e410e106ba13906ca01ab1222ecedae9fb855a246c0ba5de286bf2f7
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves luring users to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://catamma.ru/uplcv?utm_term=acknowledgement+for+project+school PDF link annotation
    • http://shinies.ru/img/lib/file/xixefek.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/27243841229.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/50170720630.pdfIn PDF document text
    • http://grapevinewinerytrail.com/clients/876125/File/riparokiwixiluvenir.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/9720e1965b8f0cf78cb991f5073da5b5/85891255415.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202108241829471680.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/4464f9984bd0fee3e8c5e2387c489c44/43747150309.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/80210228555.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/161100da247d8e---watetutisul.pdfIn PDF document text
    • http://fluellensoflandreth.com/clients/b/bf/bfbe38bd58d8cb8bd08b82175287e3b3/File/goromegamemerowimidefexi.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/fd81dfe759dcdc52690897583bbbddae/59516105938.pdfIn PDF document text
    • https://ready4use.ru/uploads/files/zapazudoberakusonexupiwe.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/f53efed4a1b0b7f96801c687f4a54220/21574012478.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/20870781208.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/kaxibobipetixijebojulazik.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/bt6kl7chvbh3lhbpsusp64vult/zimumidukixunudenuba.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/da753fa12ade025cea858e7c504f1560/21423112701.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/05il9mjcj2mnp4essp56tq9cc4/8895643625.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/voo03213nti6o2e3qp3qaun3bn/99623839323.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/2aff54b33f1667532f12d1084ac45d0b/nuwagogusitoterelikonovi.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16088fd524f40d---48956286648.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/51357570406.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c923c3b14c---12878237089.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f73cc6cdf9---68431838883.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/28769902135.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/qk5rli2nulvivqfn7fqm7imsdo/nakemotufijugotafupa.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/63013681503.pdfPDF link annotation
    • https://vipbeachhouse.com/uploads/editor/file/nobusuxosi.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_off0000d752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD752 11104 bytes
SHA-256: 2828d122c00bb39d7b9fbddf98d6f7e6e1a294e6f7e6c6b63e7d0b90f6534e77
font_01_sfnt_off0000f0e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E6 17776 bytes
SHA-256: 5c8deb54ee8827f59127e3b617cf39da196fef812954e7d76cfc6e4448f46743
font_02_sfnt_off00011ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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