Malicious PDF — malware analysis report

Static analysis result for SHA-256 c61fb8b8564a612e…

MALICIOUS

PDF

82.7 KB Created: 2021-09-02 12:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: deb94e062a68e91188d5c2480ba5c872 SHA-1: e41c404da8a1294150e474babfd4098afcda62e0 SHA-256: c61fb8b8564a612e201ba0897b477319867b3694942fea5302746f43af7dd31d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, many hosted on compromised or disposable domains. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crysiq.ru/uplcv?utm_term=balanced+diet+article+pdf
    • http://eko-uklid.com/files/file/80636292183.pdf
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/8052d10bc401f8e77e89d2bd56078fe0/pemozoxerozulifibe.pdf
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/laxogezetuvuzolune.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a98d8caeb5---11289215105.pdf
    • http://extintoresorigen.com/images/editor/26292228525.pdf
    • https://lawrenceyezersky.com/userfiles/file/misurolako.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/d7838816904baca5e0a7dc275a4c0256/41702634454.pdf
    • http://metisentry.net/ckfinder/userfiles/files/40625901430.pdf
    • http://electrogalicia.com/electrogalicia/recursos/archivos/39895518840.pdf
    • https://sharadsangam.org/UserFilesTwo/file/kebokewatikigalodi.pdf
    • https://paklya.su/design/img/upload/file/98481690343.pdf
    • https://alakharia.com/public_html/userfiles/file/41003241813.pdf
    • http://geopraxis.it/userfiles/files/fidipozis.pdf
    • https://armagedonspedycja.pl/files/file/56230261925.pdf
    • http://tsradviseurs.nl/mailing/images/photo/file/54430396852.pdf
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/namegikosewetevumujad.pdf
    • http://seja.lv/assets/ckfinder/core/connector/php/uploads/files/mujiwavip.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a70883cb8f0---52436439440.pdf
    • https://alusol-kw.com/ckfinder/userfiles/files/lizukerewetusisuperinum.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160777e18e207c---17769305616.pdf
    • http://highendschmiede.de/highendfiles/file/fexiwonabugufutulu.pdf
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jitixuwa.pdf
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/88387940531.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_off0000e087.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE087 16792 bytes
font_01_sfnt_off0000f89e.bin
6010f6f9e3babb629fc3cd668239d3b81b90e40023b144119aee258baaec8679
pdf-font-stream PDF embedded font (sfnt) at offset 0xF89E 10380 bytes
font_02_sfnt_off00011028.bin
33dbcaec555cf1ff1f23d5f46f2e6d5ffb9f9bd3c32f0a558be1f9f2531d85ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x11028 17464 bytes