Malicious PDF — malware analysis report

Static analysis result for SHA-256 44319eab8dcd36a0…

MALICIOUS

PDF

92.0 KB Created: 2021-06-26 10:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7319cb7855d8b1569bf0b3adde821a5b SHA-1: 34e66a5c5e41ecfd6d350d3a909bac5b18062f97 SHA-256: 44319eab8dcd36a086c1e0e2942404a5738293bacb60d00c6fb3df5001f1554f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads and disposable hosting. These links form a link farm, a common technique used to obscure the final malicious destination or to distribute various payloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • 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.
  • 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://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/1ap4ohfer515o8onul2v3jmjb1/77786548622.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608192a1e43f8---lanigofiv.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160761151595e5---sesisabedarojidili.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bc3b6e73d---napibe.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b16ff44b943---50009772971.pdf
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/f4ec7077ff8e7adbfce031fed1fdcd21/62824487029.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160731decef237---meragifatikij.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c18741bec82---xafuxo.pdf
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/dkar5f9nh3v2ksp980g6uvq3g1/jugimulijawofup.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c29bef2df---tutaxebiw.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721f51d3e66---vozepimusesemolasaw.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/83mjeqpsffhf0t6d69fuod0s9n/niwetezi.pdf
    • http://agriturismolionsfarm.it/userfiles/files/wuzavolidile.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c727cd53bae---regeveje.pdf
    • http://thaihotelsale.com/FileData/ckfinder/files/20210606_3906F2D74C6A6CD7.pdf
    • https://birgatour.mn/js/ckfinder/userfiles/files/kogonol.pdf
    • http://madmojo.com/fckupload/file/9159364274.pdf
    • http://aucoindeshalles.fr/menu/file/namusopitopaleg.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f761a19997---52934507788.pdf
    • https://adreshosting.com/calisma2/files/uploads/gujimitakaxojifosugepu.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/8c1ccp9jmsnhlbuv8hqsliahjc/vidobovekemefumofej.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=hand+specialist+near+me
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010660.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10660 16792 bytes
font_01_sfnt_off00011e72.bin
ad060285f4e4569efaea36c47e8f5614be60db7cf8a50bbeb8ac0bf9413dc260
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E72 17184 bytes
font_02_sfnt_off00014b29.bin
df0a23b759c50d8573789cd1e663235dccac9ea75d7c80bde6531fc7d20dcbcb
pdf-font-stream PDF embedded font (sfnt) at offset 0x14B29 10544 bytes