Malicious PDF — malware analysis report

Static analysis result for SHA-256 505b01aa97d61ec9…

MALICIOUS

PDF

104.5 KB Created: 2021-06-29 00:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7502f3aacad2404ca78e13f8e6ea544c SHA-1: db764c045f6b98d71d10907e4245ee57fa687dab SHA-256: 505b01aa97d61ec962f0227ca2f3530cfe90c1dd858308e24977c5336bf22740
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, indicating a link farm designed to lure users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://crysiq.ru/uplcv?utm_term=hottest+hollywood+actors+female+2020 PDF link annotation
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a695071e775---13137104008.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/kajipafusolotujemanud.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d16a71b603---bopiravanebufefofupawosu.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b2a8dd01e---57194891304.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/dasalakukomuvazusewup.pdfIn PDF document text
    • http://lroundup.com/clients/d/d7/d7466da0ad72d96b64793f89c518a0d9/File/8256383169.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/9de3b4c82d98e5a6eed3d2f131d510bf/fuvovutu.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/83815657660.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/69709083915.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210607_51E6B15EDB02812D.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/98311449170.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16081b2c9cccc0---buretomumivutunuvuju.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///44083305494.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/dozonutosuzubawijowavok.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1609951d776d79---57242500957.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/9fbcbb70c47e2c05bf6f0d54e1d4c898/91160116388.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/wiludonisawujad.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae856c9a72---1669116010.pdfIn PDF document text
    • http://poiskvod.ru/images/file/24007556938.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202105/file/1620608232.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608be3f27eb9f---jilad.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_off000133d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D5 10976 bytes
SHA-256: 119ae018e5f2582585574a63f5c78fbf8238dc13f27090851b19d67c335a43f6
font_01_sfnt_off00014d7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D7F 18656 bytes
SHA-256: 5ffeace6f257417055e251b8237c8267070f65e90662d4057d5381104fd74e10
font_02_sfnt_off00017cc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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