Malicious PDF — malware analysis report

Static analysis result for SHA-256 39e569d1740d11b6…

MALICIOUS

PDF

78.9 KB Created: 2021-09-03 13:36:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9c2b1c1ea16f6f825247efdffc422aab SHA-1: b252289d121fc7906ce040ea4e80e59b30aa28c4 SHA-256: 39e569d1740d11b6f8b7eea9c086941db0640536512ad6b561a92cd0d0dc02c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farm characteristics strongly supports its use as a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://allytemp.ru/uplcv?utm_term=atago+refractometer+instruction+manual PDF link annotation
    • https://educhina.mn/editor/files/labuxirorakamavegunujoti.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/49610843359.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/17784249267.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611602101b4aa---nilijef.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/78960388865.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f342dba07---rozit.pdfIn PDF document text
    • http://dogable.de/userfiles/file/xinujudizojomasejevuti.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/49136e7d5f1153d872ad8b056ed11817/gajuxof.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/3d4bc45498bb916f172a01bd89ae4d0f/81956523639.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///jadusiwaxamewefet.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/b24cef799ba8b5b5e82b8809d5aecb63/84781156456.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/622fa1662257369a46457dd2af913abc/pimumugiw.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/10457f8c678dda4548ed58bab10fa3b8/32886188511.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1612e42ede79e7---27717880011.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/7d3c81dcf58405badeae8177445c4c13/51552543278.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607da60758814---37283434044.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/7584634ad228a52c8b94eef233350872/witelato.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608374d81331f---verovuriwe.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///molujisilutarusurisobirab.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b9fbcb7383a---nonesuguxe.pdfIn PDF document text
    • http://caf-ljubljana.si/docs/bexadegimemedevugimakik.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160922d9a86ea0---bobejibaturukaref.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/oe9sd1kldp9a568taoohq5vg83/tovogodutazewodekazaj.pdfIn PDF document text
    • https://defi128.com/userfiles/files/taselubo.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/xuzigamorexovamesiwoja.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/90601748924.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_off0000cd6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE585 10760 bytes
SHA-256: 63642a8919f9031c1f7e40304e5818e7b0aca54ebeac2b859f6b7281e4fa1a34
font_02_sfnt_off0000fe47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE47 18924 bytes
SHA-256: b3e798d37bf4330360f680ada931bc93c45db1096d8121b08a6d831539877ab2

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