Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1a233a5056a5eda…

MALICIOUS

PDF

69.4 KB Created: 2021-09-16 11:10:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6cea964006b53cca5f66e658e808c925 SHA-1: 01688b902237ffd5f241c1f9a149a94735dd2520 SHA-256: b1a233a5056a5eda22d124d771999706083ab632340cc3b901d3ab3a0dbb42e9
156 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 websites or link farms. Heuristics indicate a link farm on disposable hosting and links pointing to compromised CMS upload storage. ClamAV detection and ML classification strongly suggest malicious intent, likely phishing or malware delivery through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=resident+alien+episode+7+watch+online+free PDF link annotation
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/tubelejidimuxur.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132eeae79877---33290591352.pdfIn PDF document text
    • http://uchid.com/uploads/file/13248281376.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb5a29059a---13796020918.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/169976671.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210906_15987E6512C64A13.pdfIn PDF document text
    • https://uzsienis.cvzona.lt/resources/img/files/31287682799.pdfIn PDF document text
    • http://gartenbaukoeln.de/uploads/files/bowili.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1612edd81aa8e4---zosiniruferigujagetu.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/14538016622.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/41275577323.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/63341936443.pdfIn PDF document text
    • https://highrise.pl/file/xemoj.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/50a0e293dc6c32ea4de72736f5a46b1c/96951204621.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/65590793599.pdfIn PDF document text
    • http://grimastone.ru/files/7066370182.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/sibukidukomabiriberumod.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/161394a9061fca---buxidojamugelebasim.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/75779537181.pdfIn PDF document text
    • https://sieseam.org/userfiles/files/lugozalasaxo.pdfIn PDF document text
    • http://tinhdaurosa.com/Images_upload/files/savesegovenukab.pdfIn PDF document text
    • http://codienlanhtrangia.com/Images_upload/files/59510855624.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_off0000afc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC1 15292 bytes
SHA-256: 60e478bb746f62af41b125e9ad2f878201f9ab5b7853718c6e32d03f5fa3fb82
font_01_sfnt_off0000d67d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67D 10896 bytes
SHA-256: 6b15c4350c1ec354821935b60311732cd7d0fa00916736eed942f96a45aeab25
font_02_sfnt_off0000efbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1