Malicious PDF — malware analysis report

Static analysis result for SHA-256 a08978311f9695c8…

MALICIOUS

PDF

89.5 KB Created: 2021-07-17 04:58:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3c28b4ad46115d674c195046538d8bde SHA-1: 56c15255eae6a3ef057af3e371b03c9994612705 SHA-256: a08978311f9695c8df36206380c50543da8be2126135f755d8120829c450b906
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics confirms the link farm nature of the document, likely designed to lure users to external sites for phishing or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607b38bf53fb7---patotovibutebawidixar.pdf In PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/4d665d3e0e4fe822c4112dc6d2e1f3e4/nederepopevovutepoxid.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/jijubezawikafi.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/vesunevedomuwugejudovom.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/wumebijegododutexa.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/3340bc1dbf9bea9a418f7c09bb6a1008/39224078641.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/mleuegfth504l060so9t6qfve6/73667388553.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a92d202c27e---biterawenadix.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609fda9232688---65187448505.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/gojerilixuxakidudaso.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bdb6673ca3---waxifovesiwuzoka.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/0b73871321e1be7f32aa211bc5e70f83/52295387624.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/66439577355.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/fajutigapowesasir.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/1bec6240f7f11efeb35d9e596d54dfd8/14098552518.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4c4331454f---duxoge.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/21262487087.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/57542916701.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/95942ls18jrca18d8kombekviv/xubisogujojukemapur.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/e79f8c8fbb807ee9bebe8903380a083c/43536160216.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/ihouhet9n869clj2lark3tico7/46491057435.pdfIn PDF document text
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/sixusivejonetetixo.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9f6e8ecbb---29527269305.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aede3ea5d3---xemozupijurawuteduxer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=ls1+turns+over+but+wont+startPDF 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_off0000faf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF9 16868 bytes
SHA-256: 8d8b22a779bcc56dab446bd6896e32ba412caf924a2056956fb793aa8b0dde45
font_01_sfnt_off0001270c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270C 10364 bytes
SHA-256: a054a996a7daf9d59e81981e8bfc52e0ea5fb87fdcf58683aa289b490568835b
font_02_sfnt_off00013ec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1