Malicious PDF — malware analysis report

Static analysis result for SHA-256 76146a761c0b1569…

MALICIOUS

PDF

94.8 KB Created: 2021-07-07 13:43:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 00d8b34e1154c09cf7f7c9d5bcbd91ac SHA-1: 208a9ff341f76e37498fe309bcbf593bb80c5585 SHA-256: 76146a761c0b15696540351a1c62b377f08d4d34afd692e411cbd78d85361140
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised WordPress sites and using UTM parameters, suggest a link farm designed to redirect users to malicious or phishing destinations. The file's structure and content indicate it is likely part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://philabc.ru/uplcv?utm_term=write+a+story+with+the+title+a+second+chance PDF link annotation
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094a8178a413---sasuruvareloku.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a98f688f7c3---25134846417.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/35251560885.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6aed8e672---46224435595.pdfIn PDF document text
    • http://forglory.cz/ckfinder/userfiles/files/30625538696.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/vnc1t7q78mk3uhqq22ude3o3kf/xomurunoxesisozemadebomo.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/24f450504d9ed227f37f0656db7cc683/43053659516.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb239a6058---norimuvolu.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ee56857d5---jarawaxubatodirotuxererox.pdfIn PDF document text
    • http://ktcz.eu/files/files/56798290009.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c6368769b---tikis.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/5fe9ff23e752f09b0212613f8739fb7c/xupawudifigolofugoweloxi.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/65358c48f6ef7bb37cb236132f5ba654/88291187196.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/magisegegabemumefulonud.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/10700584404.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/l1e8vvqel6qoi7bra6rquftg00/gifipepa.pdfIn PDF document text
    • http://tebsc.com/clients/84181/File/tabobawagofesajixov.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/1529c69329eef46db71e605235896f7a/wonapedivukopef.pdfIn PDF document text
    • http://boisehighclassof1965.com/clients/879780/File/68822326169.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_off000111a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000129b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B3 16936 bytes
SHA-256: 694b0b3973d943ee7934efb815db5f0a1ce3a53d49137c6fa0af613e4c698447
font_02_sfnt_off0001558a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1558A 10660 bytes
SHA-256: ac61f05b76430952ac4d1ac2dc7b118f51ae57275dd4ce29dab89399b9a79ef9

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