Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d1db5b17f8086da…

MALICIOUS

PDF

69.9 KB Created: 2021-10-08 20:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: c70840a90165696c1f91b12064778e8b SHA-1: f45e4e456a22f0a9df5103529c8e2c804a4e79e9 SHA-256: 3d1db5b17f8086da32525247172edbfedbb6b250768d55bbf2fa7ab4d2d66fe5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains a link farm pointing to numerous compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farms indicates a likely phishing or malware distribution attempt.

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://philabc.ru/uplcv?utm_term=bad+meaning+in+tamil PDF link annotation
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614c6e3790c9a---zulobapugiraru.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1616068592e0d6---1086380149.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143cd658a1fe---83847615359.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/zivudaxetuvokexu.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/kinorereralugeresi.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/qckur6k78hcujjs8ev3vdhgvfv/12470450334.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/balotavujirafafuzikifat.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/vupanepigederub.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131e223c78dd---lugip.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/bexomesobufotudole.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/sibiwefuta.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1615f297d21cb9---81263377069.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/98237137925.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/kamipux.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138055b15b0f---gakezepisivewukitirafela.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/b3d8330c5f573cebb545a95789a64da2/78035090270.pdfIn PDF document text
    • https://hojoairport.com/images/file/90069464551.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/bodotiradutilogedote.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/8befbb8350249f0a5d8d53aaa6b8c159/51065809934.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/qt445t9opl73tdv4t4qupl8ei1/zubavure.pdfIn PDF document text
    • https://magnanelli.com/userfiles/file/nisegavegonafugidefeb.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/gilitiwijigigumogakazixug.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_off0000b070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB070 16888 bytes
SHA-256: fcded1303d3f010d6960788ea0f134c143b7368212a92ce1f6eed5d8430d8dd7
font_01_sfnt_off0000dba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C0 10256 bytes
SHA-256: 9cc8847695b3bc872c805b8b51aac85edabf6e3ab8b479fbaeec8841601788b6

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