Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbd04733b141579a…

MALICIOUS

PDF

90.7 KB Created: 2021-08-05 22:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5edaa2067b7a61de7737c5f099014a88 SHA-1: f1e9160be5cadd3097d31004189528117e5857e5 SHA-256: cbd04733b141579a929ac798f6c3961a7d2556c8e2db29a8ef94c65cce0830af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised WordPress uploads and other disposable hosting, suggesting it functions as a link farm to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://crewmak.ru/uplcv?utm_term=how+do+you+write+a+formal+letter+of+undertaking PDF link annotation
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/nebalujed.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075cd2fcbf4d---lelukime.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/5801b0d4d398c245879cccc1017c7e63/xetiwililubugo.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/lafisuvapegamig.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/56722548773.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/42967610179.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/xaxutege.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/9471719272.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16083dbd234319---moworoninel.pdfIn PDF document text
    • http://pcwest1980.com/clients/9/9b/9b13e9c1eb96aaf026ead536bb80a376/File/73928261944.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/d83377786fb3d41f65eaaf399fd012a8/32771989503.pdfIn PDF document text
    • http://c-amc.com/upload/files/kubuwoxamezusi.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/psf12mq9s2hhmljl097dc0ojp1/64782024004.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de159a573cd---48715563829.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/pakum.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/66567048311.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/6b9e45d72820726ad0615daa385fb18e/sufikobujezabe.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb7705c715---78914789411.pdfIn PDF document text
    • http://one9five.com/userfiles/files/41626703981.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/tufavasuweromibokoxopoza.pdfIn PDF document text
    • http://rafaelokazakov.com/file/5622813343.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ad0f220cb---vuzekorazutawewoziduvobe.pdfIn PDF document text
    • http://abwessex.com/uploads/files/lorujuwafapotodu.pdfIn PDF document text
    • http://pro.ovh.net/~tribuene/images/banque/file/42571481536.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_off0000ff4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4A 16648 bytes
SHA-256: 9c544f8dd81ecb2d2dc19d6268dced773ac200c5078b9a71ace1f694e8e269f6
font_01_sfnt_off00012a54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A54 10912 bytes
SHA-256: aae70ef182f9763844d16742abce8a8ed66228c2b4806665bea87ab95bb5bea9
font_02_sfnt_off00014361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14361 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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