Malicious PDF — malware analysis report

Static analysis result for SHA-256 26e4f45f71bc2d9b…

MALICIOUS

PDF

86.9 KB Created: 2021-07-21 23:19:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 15657f7360ee408a900d1350d8b69766 SHA-1: 33677c61a93d1e7929834c75a2e7601fee9eb25e SHA-256: 26e4f45f71bc2d9b4ee3d4db801e7c358d7eb061dfbcf41835c3c1b7f8411ede
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. The PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic specifically highlights links to compromised WordPress uploads, indicating a potential distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://partnyor.az/userfiles/file/14365536028.pdf In PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210716_4F829B628C6E42DF.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcd879a736---88717080743.pdfIn PDF document text
    • https://epiphanych.com/images/file/54246292711.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607797f02fdb4---38723771693.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/64358025975.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/mideju.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e9294973e6d---tobutovi.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/62391215124.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae81cb54631---gatexipib.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/sujovowokefu.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/2f743f759e0d9cdbad6c22231a8d5641/70705943214.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/64b888ac18758e03c05db92cf9d87f3a/55812824614.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/98066478665.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/9vngt8bf17godopr0dqtoh1120/kevovofumumakadoposip.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088084ecd45f---noxileto.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/jitikexosigud.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/wuluperemibisofogarax.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/17650792155.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/35075157892.pdfIn PDF document text
    • https://pasarangroup2.com/contents//files/doxijukive.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=carbohydrates+in+the+bodyPDF 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_off0000f29d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29D 10584 bytes
SHA-256: 73548d555f2620b6ac12f9008115db40a57db2f1b2fede764cb9b27681ce906c
font_01_sfnt_off00010ac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC7 16668 bytes
SHA-256: 5787a5227e29d93bc48b8209ba1f193e4ba971ba6849f8c1244339556e6b3e1e
font_02_sfnt_off00013648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13648 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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