Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ae37e959cb0c09f…

MALICIOUS

PDF

81.6 KB Created: 2021-09-03 08:24:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f4e78560dd0ddbdb2c255a5486b411d2 SHA-1: 6d9d112d4c8aa9969bd8afd1acfd5dde317c0286 SHA-256: 3ae37e959cb0c09f138ae1aeb75d1bee494aedf77c7062d55328b35cfc8ba603
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the structure and URL patterns are consistent with PDF-based phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://krisoc.ru/uplcv?utm_term=dental+abscess+treatment+pdf PDF link annotation
    • http://world-spa-resorts.com/dok/33095443001.pdfIn PDF document text
    • http://vtaky.sk/media/file/84821693012.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/cb96f7686df2dae7dccb2d8c79f0c2b3/11408035286.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160915117cfdd8---wafuvibukijasijaru.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/75499218967.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/3e1966df4054e79c2429ecf9c13e828b/gafemepaziluw.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/sipadog.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/161245e82a491e---tikagadarewegivovizoxili.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/093b0bddf51f813f61f2e884f2bfd458/59963918247.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/menufir.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/tutupolizavaze.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/36061982690.pdfIn PDF document text
    • https://menu2uplus.com/images/file/tazevalivexofagage.pdfIn PDF document text
    • http://sun-tes.ru/files/file/sorexutonigovenesuwo.pdfIn PDF document text
    • https://airshow-bg.com/file/40936656260.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/40093490316.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/97271812625.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/piwuwuxatab.pdfIn PDF document text
    • https://adikkeempat.com/contents//files/kupalibofapefejirexibivug.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/52762179499.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/29211984702.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/37825422530.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210813084216_5wpjvn.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607d34fe5cbbf---muwadomiwejewumarori.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/kuzebemufusar.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_off0000dbfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF410 17024 bytes
SHA-256: d10495f84ece9b0643a62868320326e0f9f502036da3b771fcbbee5f5cbb44b6
font_02_sfnt_off00012023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12023 10712 bytes
SHA-256: 53384489d333ff0b82496f806f44264d2bb7317d53703d87603922a628c8e6bb

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