Malicious PDF — malware analysis report

Static analysis result for SHA-256 d604a1fa321bd77b…

MALICIOUS

PDF

78.8 KB Created: 2021-09-05 11:10:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 732dfe49e7a125b5c2917fd9c2ea8968 SHA-1: 8e74bd0da40fac4aaf100f2245dc099de1222bef SHA-256: d604a1fa321bd77b4d35ad45c5e737ec5cfab6f4590210bc13e1da82c846c530
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting it's designed as a link farm to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://garglob.ru/uplcv?utm_term=kenmore+sewing+machine+385+manual+download+free PDF link annotation
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/blo3k6pft5pr2shv515nlp640n/nebedapanamosudarubobusat.pdfIn PDF document text
    • http://01host.ru/userfiles/files/jugodoponakujeje.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ece7d5480---bamelote.pdfIn PDF document text
    • http://selmanoglusigorta.com/userfiles/file/82002309975.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1609e73a7586a8---16224181855.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608053a6d5ed1---32155907619.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/mojabodolotopolokegin.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160850e06c9b00---sukanixukave.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161272a81cbec6---34844796675.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/tusunugibi.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/kotasorisere.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/10692032424.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/xunazebukinixebonukesika.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d97a188cf7---83547763052.pdfIn PDF document text
    • https://anjingliar2.com/contents//files/wavaxozowetel.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/42021084237.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/98673003799.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/dekegopunuxegug.pdfIn PDF document text
    • https://norservis.com/files/files/62151582904.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69286392515.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16258465574161.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/2130b16104056ff80e09da5f1f732113/lerudug.pdfIn PDF document text
    • http://redsky.tv/userfiles/files/83661708277.pdfIn PDF document text
    • http://newtrierreunion1962.com/clients/6/64/64567561842b0bbd40b956adda0282a7/File/pamubojidekaxodumegutixa.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_off0000cdc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC6 16824 bytes
SHA-256: bd67d4d2436ffcefa35a66383c7a525aa362b2ae5f5fd744ffb7283018158f96
font_01_sfnt_off0000f8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A1 11516 bytes
SHA-256: 98921d9651c150d6ce6f24d3ef4c927d3b16e86ef5f172c1c7a7de45a4675dae
font_02_sfnt_off00011399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11399 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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