Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5a072db90c69011…

MALICIOUS

PDF

71.7 KB Created: 2021-09-02 04:30:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 022182071a583116d2506306756c1181 SHA-1: 82ae9f0e557ca837a8d632c333959f4c20e332f6 SHA-256: c5a072db90c690119f2bac0e4107786ece5097b8ee020577e1b00a9f8ede4fae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links. The document body is unreadable, but the heuristics and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cowichanmusicfestival.com/userfiles/file/49396784815.pdf In PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd43ed2002---zalul.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/nuxup.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/8ecc7c0ce1114087bea6c744e6f7b4b6/zokajepogajonotozigisose.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607c499318231---54648864723.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/2h1li9e13q8qkq9l8disa4tajr/9726545110.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/12046841924.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9c64c8f0c---vipeduseseviluwo.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a908527a32d---23501456439.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/9mpjtl5q14f0viutl317jl08sg/sumeju.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/joxono.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210730210759-24142200878.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/subobikofanewujegudime.pdfIn PDF document text
    • https://proxus.nl/file/gejibi.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160adf133c55d6---21088283562.pdfIn PDF document text
    • http://normandyclassof79stl.com/clients/e/e1/e16d7b8530e96d8d426d6b963c92b0b5/File/vaxuwukikusapepagito.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/69325187753.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ee189c618---25651604052.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/tunosananiwutanilunuw.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/52535855241.pdfIn PDF document text
    • http://rjt1.org/upload/files/98400115230.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/4382249074.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/36157818284.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/dd15d65ba3b95cb3eb23853410404dc3/fowuvozababukomi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=choices+unlimited+gemsPDF 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_off0000b7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7AC 15920 bytes
SHA-256: 081fa37e80ca21e6e89dc6c01c4ea1c597a00e0bfc0cb69f403ee152fbfecbee
font_01_sfnt_off0000dfa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BB 10688 bytes
SHA-256: 7260fb83e30f4f0281a8984bf090ff01a414f33e56684b13142911c063ce9aab

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