Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bdbf4b394e784d9…

MALICIOUS

PDF

67.9 KB Created: 2021-09-28 01:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e457ddc3195e048d64f69ad6c0f1901a SHA-1: 89cb96540f0b13131352c48bdfdadabe229ee96c SHA-256: 8bdbf4b394e784d9eb1d005f94c1add5f20baefb83fceb164d131af98ceb062b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as a phishing lure, likely designed to trick users into clicking external links. The heuristics indicate it's an image-only document with a click-outward action, typical of phishing attempts. Multiple URLs were extracted, many hosted on compromised CMS platforms, suggesting a campaign distributing malicious links. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 https://synerhu.ru/uplcv?utm_term=1+trillion+in+a+binary PDF link annotation
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613568ff42e92---lomujuzilegarijemamox.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/biragofubaxawu.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/964409083.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/fa95fbc8b10175afd30a21a62093038a/70034080611.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/41245428367.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16142a400a8acd---69024679670.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/32084343064.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/zopomefesomu.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/rewalenofibubaso.pdfIn PDF document text
    • http://yibetter.com/data/files/xezumiwipeke.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109280046152792.pdfIn PDF document text
    • https://asi-filter.pl/files/file/33005676651.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/57783929092.pdfIn PDF document text
    • https://eklyps.net/images/file/60548930884.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/monila.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/8022694868.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210923172436.pdfIn PDF document text
    • http://dodogs.ru/sites/default/files/file/dasexuma.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/24891366569.pdfIn PDF document text
    • http://vitrine-prof.com/files/88357392354.pdfIn PDF document text
    • https://podimercrm.com/img/files/6171041443.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/40264172435.pdfIn PDF document text
    • http://osayit.com/images/file/tedulumirodebunurumiw.pdfIn PDF document text
    • http://coumert.com/images/file/fasikukafik.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_off0000afa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFA0 10012 bytes
SHA-256: ee6fc85abb5ce1d66e53f9015fdcfbecac5741d3ed08f56043a179daf0d4ee56
font_01_sfnt_off0000c5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000de02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE02 13876 bytes
SHA-256: f6103225f2954c2d26aca0f658444d1a5b761f6cbb82e90cc3c2aab36e58f740

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