Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c754e512f6e4c96…

MALICIOUS

PDF

79.6 KB Created: 2021-09-07 21:34:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: da7c9a61af30bd9b743c4ad8dec729f6 SHA-1: 25eb6037eeb6c175d8946ea6a4c109363e7f9713 SHA-256: 0c754e512f6e4c9642fa115b897fcd4b85597428e27b581d1192cea7a5d1cf6d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links pointing to potentially compromised websites, indicating a phishing or malware distribution attempt. The presence of external URI heuristics and link farm patterns suggests the document's primary purpose is to redirect users to malicious content hosted on these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://langeline.com/ckeditor/upload/files/64246423483.pdf In PDF document text
    • http://chonburi33.com/userfiles/file/34190183756.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/aa9a89662a11ec3fb875a70d3aad5e4c/29071132666.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/d4a127e9c5c505aba4cda4108a053905/33440178992.pdfIn PDF document text
    • http://carszana.com/image/upload/File/ruvixalunu.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bac3426c1---96829441380.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/70485222915.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/bumolawufugikog.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/95037133085.pdfIn PDF document text
    • http://soflacops.com/clients/83266/File/24960521456.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/lupabewimububuxod.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a6050a1594c---25854336564.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b357d1e058---12008290972.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/38256266810.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/doduka.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/37043999293.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/mabetigetimejile.pdfIn PDF document text
    • http://josquin-capella.de/download/migotoka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=biomes+book+pdfPDF 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_off0000d1a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A3 18532 bytes
SHA-256: 6dd6eb35b12d9c8bb5f223d900af4c191c03a134533a1aca18106bc0d64afd5a
font_01_sfnt_off000101f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F8 10432 bytes
SHA-256: a474107ecdc1387f6082946179441c68e28adf00608b223e97ad84c82137dd7b
font_02_sfnt_off0001196e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1