Malicious PDF — malware analysis report

Static analysis result for SHA-256 878826345085b7d4…

MALICIOUS

PDF

73.1 KB Created: 2021-09-01 03:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 31c81284f3e39991faaa01a87024b3f5 SHA-1: 9e0b19a40e070b25e55e7f851fd7b1c32c371a8a SHA-256: 878826345085b7d4ac9976e8963cd70a72fc8ce5cf47efd614ac06d41ecd1aab
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The embedded JavaScript likely facilitates the redirection or exploits vulnerabilities, contributing to the phishing and malware distribution intent. ClamAV detection further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=sonic+and+the+black+knight+gameplay PDF link annotation
    • http://nowyhotelik.pl/userfiles/file/xapowidojuxe.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/kegajutasumok.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/78428151042.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/30339373431.pdfIn PDF document text
    • http://maidichike.com/upload/files/lamikazironawatijotoziven.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/5381dd338bd500e0bc740a12b3dca399/dezawaw.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/128e6a50fe63e1ecaaf663e96d0c8e34/ripovidamuwes.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/c0otee3pmv8tasj1jjnlh2fhfr/wimupejododisalupexuvit.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/691536ee247732ef9eaa05fdfb7b97ae/kujovuburubenijix.pdfIn PDF document text
    • http://ligneus.hu/upload/file/fuwadawimubagide.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e98b8a7b5---5098291210.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/73107134123.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0bbf0884d---lomopukifolaxosezasi.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/80846881549.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160729d0885512---tisufar.pdfIn PDF document text
    • http://labsshop.com/d/files/80155690946.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16076c42960649---61951165433.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/64268020677.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/91996645880.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/wimikovumugepivovotize.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/sapazoxavur.pdfIn PDF document text
    • https://bloomeng.com/uploads/wigubokupitekifasoki.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/2360037551.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/ligigobabobavudoputubu.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_off0000b8bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8BB 11112 bytes
SHA-256: a42d6ec80deb547b51c7854e8a4d1ed2d8845860b56d5b3bf2c6ac37a0abdc92
font_01_sfnt_off0000d20a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20A 16964 bytes
SHA-256: adefb3ae906d5647255eb26307dfd6223a36333623adec1b3d388aab84f576cb
font_02_sfnt_off0000fe51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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