Malicious PDF — malware analysis report

Static analysis result for SHA-256 55ecc5cad9f4365e…

MALICIOUS

PDF

86.4 KB Created: 2021-08-13 03:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 416165cd954c046ed0c115617edb8d2a SHA-1: 0f35f2e40e9fd5bcc6e1310de2b60617824b674e SHA-256: 55ecc5cad9f4365e87490b17ba776f08e04f3d8ecfaf1ff5d22dfac02fcdf46b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. The document functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, likely intended to redirect users to malicious content. The presence of multiple external URIs and a link farm structure strongly suggests an attempt to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://www.channeloflove.com/ckfinder/userfiles/files/bemikesalubolax.pdf
    • http://amadpich.com/userfiles/file/xixifife.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160859f8d61b3e---51843764604.pdf
    • http://hocikto.info/userfiles/file/16354548883.pdf
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/19266039339.pdf
    • http://mp-hd.de/data/aktualnosci_imgs/file/fomiv.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16078f32c258d4---vetagipafor.pdf
    • http://rghsalumni.com/clients/82979/File/80813722263.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/lp9f35e10f81v7jukugte5ohhi/70594383724.pdf
    • http://malverne69.com/clients/a/a7/a743c233813d1a1dbf5c38c484d85cdc/File/15117680720.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/f7dff78e115294dce6410544027d6a06/guniwowuvabaleluturaji.pdf
    • https://namkhoasaigon.vn/web/images/files/gatutij.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/af1797c87cdfdaa12e20e3d49e92c8f4/wumuvulip.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42de714004---90023897581.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/8b6b8aa8b06af96f546bbb59961facc7/xegikotizolavokerixixusel.pdf
    • http://wildpflanzen-planung.de/file/veresusifakatesilozuzewe.pdf
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/d44eb28e30f31cb2d45822a3829a3cfa/94492888516.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609893fc55777---35665324837.pdf
    • https://elearning-chemistry.ro/userfiles/file/xovajogalag.pdf
    • http://naturallabs.fr/userfiles/file/taxupalexofodiwefukazi.pdf
    • http://schokobrunnen.com/idata/magetedijomili.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=mod+apk+offline+games+list
    • 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_off0000ebf6.bin
ec34c6a077b4c732f371c89563c6f4044e58918f6fa0c741d7d0bd834eb7169c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF6 17576 bytes
font_01_sfnt_off00011a57.bin
1f78077153cee3ab7dfbe0ee1b7f230d7c5f5578b8b67e587a06882fce16f9ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A57 10824 bytes
font_02_sfnt_off00013315.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13315 16792 bytes