Malicious PDF — malware analysis report

Static analysis result for SHA-256 940f89b11c77857a…

MALICIOUS

PDF

93.5 KB Created: 2021-09-13 09:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8eb8f12c3a9281e7183e030716fd235b SHA-1: 4caf0c69692d5c876e6e321a58411420af938b9c SHA-256: 940f89b11c77857af48aa1b05c67ad71d0dd81e78ccae4dc9e6a2b86faba9702
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick users into calling a phone number, a common tactic in phishing and tech-support scams. While no scripts were explicitly extracted, the presence of numerous embedded URLs, many pointing to potentially compromised or disposable hosting, suggests an attempt to redirect users to malicious content or phishing pages. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://arsvet.ru/img/upload/55830998421.pdf In PDF document text
    • https://rainbowfurnitures.com/files/files/zisoj.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/94026472993.pdfIn PDF document text
    • http://naim.naparts.com/images/fck/file/litalase.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/dabedus.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/zosoxemobifasudu.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/c7a8998f8bf924542a68d7a9fbb87e68/46096505430.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/613c03b21ba30.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210903_A8DE5AD0F1F7E3F0.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/sabunun.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/upbt3lda16bj21n614e3c96p61/lonilegekejesujujojato.pdfIn PDF document text
    • https://ewt.cz/res/file/85864577222.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/13815291832.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/99333157626.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/febutifedatabowewa.pdfIn PDF document text
    • http://araulmor.tel-cor.com/images/library/file/83786252637.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/13907551920.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/86494796184.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd9f6e9851---bijef.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/40887743205.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/naxolosat.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210901024455.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/17731779756.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=h+words+englishPDF link annotation
    • https://mediaget.com/userfiles/files/fufovinofobetijoxepo.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_off00010b6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12382 10344 bytes
SHA-256: 3f2dd921c6e12eb08dc8c9c5a9fd72b84915588b2cf064ef85dd2222e69917f9
font_02_sfnt_off00013a82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A82 17848 bytes
SHA-256: 3033508e05f2878421bcdd4e113aa824701c46e9c6d55fc86332b089ff4774ad

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