Malicious PDF — malware analysis report

Static analysis result for SHA-256 30907c8ec7a5921e…

MALICIOUS

PDF

88.2 KB Created: 2021-09-06 09:46:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fbfd44829df7568270ae5678b95c1df5 SHA-1: db765f29fc801f77cc856ebfef114f681d4a7fa5 SHA-256: 30907c8ec7a5921e8ab3a78c3617844a4016a7fa499ec5acbc906d59fea5a92c
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and a link farm heuristic points towards an attempt to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://catamma.ru/uplcv?utm_term=current+affairs+february+2019+pdf+affairs+cloud PDF link annotation
    • https://leo.tw/upload/ckeditor/files/68746539966.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/44431d2a6d24db86a7d1429a8ceec9e3/24396817037.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b8ff080e6---19477160173.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/jncrkn8uepd8g9jf86s675l9lr/fidadafavitozafupuguzifo.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/wepulomi.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/nixigajovawolewa.pdfIn PDF document text
    • http://93564497.com/userfiles/20118326531.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/6ed64116e1f006bc98a481eced1847f9/lubaxabi.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160902b265837a---koraberanevuletobamideda.pdfIn PDF document text
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/leboxudojavofanopikijepab.pdfIn PDF document text
    • https://wasael.com/userfiles/file/kudekefibugami.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/5872c1dff48a66ed2c1c78860db67ca5/49579126819.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/bogul.pdfIn PDF document text
    • https://medtek.vn/storage/file/78859218781.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/b4322c69547287ae28f131cbaa29af01/1336055643.pdfIn PDF document text
    • http://cutencuddlybreedables.com/_images/file/wekap.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/datudijimezis.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/kibivexapew.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8a1a68b2f---kivodivuzopok.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/20400504630.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/ebfbc6f4a9ac43c78fa2d91204e19263/69265163306.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/705832b5bf842c92b0f517c877a71f01/61659075253.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_off0000ec98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC98 19532 bytes
SHA-256: 0e55f7857992cc6fddcb664c87fc8d37957f0289b93f6932c458deb32fedf185
font_01_sfnt_off00011ff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001380b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1380B 11460 bytes
SHA-256: 3470160c92296078cc521c4df330f37a3fd1020c23bc32c95f04afc7fcffa572

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