Malicious PDF — malware analysis report

Static analysis result for SHA-256 71bed0e5a32494e1…

MALICIOUS

PDF

85.4 KB Created: 2021-09-15 23:35:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 874a35e478ef590289aeaec518967892 SHA-1: a9034c1e9f791121c39e63db1cd87116f1a08284 SHA-256: 71bed0e5a32494e1c8f3cba8bd057eec28d135eb1aa0ce57fff170ff015dbf7a
176 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and a link farm heuristic confirms the document's purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 http://manchetenewsms.com.br/ckfinder/userfiles/files/18514790731.pdf In PDF document text
    • http://avsa.org/sites/default/files/images/files/podomup.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/tavokesasepo.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/fubiti.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/25215442645.pdfIn PDF document text
    • https://equalitas.es/userfiles/file/rituwivilujuwaxo.pdfIn PDF document text
    • https://schachverein-marchhoefe.ch/fcsr/news/upload/file/zenetewezos.pdfIn PDF document text
    • https://abss.pt/userfiles/file/lipunugader.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/00106a4e1dbbf44ea9f2944d8307b631/bafemixewaxavalosifudilu.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d07bc37b63---tofawolisaga.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/wexovigimasikubutefaz.pdfIn PDF document text
    • http://retrofotr.cz/files/file/kidugozitupawafuzo.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/ha7670d4nf3ubpfevh2etkvju6/losopuzujerekigetato.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/kopen.pdfIn PDF document text
    • https://sealskinz.ru/files/file/48601651062.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/36942995748.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/klmmi0q2mttg7thp4ntoppqdup/libipowev.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/sonepaxawigop.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/15372068415.pdfIn PDF document text
    • http://balbu.hu/uploads/news/file/98245068289.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/54495527611.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3122528126.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/gudodowububinonego.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/ruseselotakisero.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=android+internet+via+usbPDF 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_off0000e6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF06 18984 bytes
SHA-256: 17d4d69f71da77009c1462649774ecee81fbd7aa56f27938a851c1a55399e1d6
font_02_sfnt_off00012fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FFF 10480 bytes
SHA-256: 93cc06b26be70db97d3ac3c879b82412170a86516ef3770e3e0427d1b67fb7b9

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