Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fd907fa3245c378…

MALICIOUS

PDF

99.3 KB Created: 2021-06-30 17:17:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 353dae3babe4ee57c937014e7c7c89ab SHA-1: 1045e413b17a48f6c5bd999aab8bb21a52951d83 SHA-256: 4fd907fa3245c378d62ad692e319191268cebb14205b592c32e1cc9f72b8bd7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/db5330f76b6c962ddbec785c1099ca98/59324206716.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a6137fa6b---vikurijo.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900e95c2571---64556593146.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f10be01ec3---26949742283.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/1d8c235f6ce12a5a50493eeb9af1f2cd/23979753682.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ac4f8c0ac6e4d893388600af679da575/50396846548.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e551b40058---xasegogafagu.pdf
    • http://fashioneducation.ru/userfiles/file/85128803067.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609462f51acdf---54653292323.pdf
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/kawijoxobofaji.pdf
    • http://lideparts.com/userfiles/file/1622211737.pdf
    • https://hinodanang.com/uploads/image/files/bonezegusatoxopiwowud.pdf
    • https://sunarchegypt.com/userfiles/file/nodikaluremusakag.pdf
    • http://essuances.com/ckfinder/userfiles/files/45389444123.pdf
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/7q3v2e5c41s0pcd6mu4iuehi90/83264883561.pdf
    • https://akproauto.com/nbloom/fckuploads/file/68469099407.pdf
    • http://unseenadventure.com/userfiles/file/novivizudugupilepis.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16073b5ef726e6---tunezoluzefo.pdf
    • http://mynigaoe.com/upload/file/20210609172519.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609907c6bef09---mamirezuru.pdf
    • http://polloricowings.com/uploads/files/75517582452.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/0e6b70358c2c038c27f6307655efac70/84489070955.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=types+of+pistols+with+pictures+and+names+pdf
    • 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_off000121d6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x121D6 16792 bytes
font_01_sfnt_off000139e8.bin
b1eb180f47f1c5acfd444d541bebdd2e16f5a9263e27c895013bd3f95053eb18
pdf-font-stream PDF embedded font (sfnt) at offset 0x139E8 16852 bytes
font_02_sfnt_off000165b0.bin
6878bc3e0cf8a8257bd0b04792b8676c520f0da8f01c0c8b8c390ba20e59c8fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x165B0 11148 bytes