Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e1c7d746a8c3f1b…

MALICIOUS

PDF

84.3 KB Created: 2021-09-20 06:31:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 32120056fd3a460f08d5f16d99febfe8 SHA-1: 335ab7b9cf569e97a908a7b6af677fe92c3c6fc8 SHA-256: 4e1c7d746a8c3f1b078ec8fddff3723209cc55632454558d9a478247382e6db6
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, including compromised WordPress sites and disposable hosting. This pattern suggests an attempt to lure users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://hometeamcorp.com/images/usr/67169448756.pdf
    • http://s13cf5ef.alojamientovirtual.com/ropalaboralbarata.com/userfiles/file/xetigixanowamobi.pdf
    • http://norilsk.torbay.ru/images/uploads/file/38354399734.pdf
    • http://elistaprezentow.pl/userfiles/file/pajobetuj.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/161449730a91e6---bekafarevutesizikup.pdf
    • https://wietsevoermans.nl/ckfinder/userfiles/files/81967469479.pdf
    • https://vnjhanoi.com/upload/files/fasugi.pdf
    • http://ucg-eg.com/userfiles/file/76011249285.pdf
    • http://koyomisushi.com/uploads/files/tovozelirusasunuka.pdf
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/57992702854.pdf
    • https://asoriofrio.org/ckfinder/userfiles/files/kusabofomelegukajudab.pdf
    • http://saiprogetti.net/userfiles/files/19326710427.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/3ca8e24c95275551f048ea3f7cfe0135/xugisotuxamigiju.pdf
    • http://tuzvedo.hu/elemek/file/nuzododexugogufuvibalose.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/434i9smqdsudm9o4pkcfis5r23/manivuraruja.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/irff4t03m3a7c53u7vp2gv0baa/tepiranazitakexaxikipot.pdf
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/77436835297.pdf
    • https://cebubigsellers.com/userfiles/file/24620927568.pdf
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/wovox.pdf
    • http://kronospan-mofa.hu/editor_up/29991442814.pdf
    • http://dabaizhongxue.com/upload_fck/file/2021-9-1/20210901133051275918.pdf
    • https://sgicorp.com/userfiles/files/ludexu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=speed+vs+time+graph+acceleration
    • 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_off0000e1b1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B1 16792 bytes
font_01_sfnt_off0000f9c8.bin
ac6755d986204eda7fc1ca112f1500ece098540aed5829873caa704b24cd2844
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C8 11100 bytes
font_02_sfnt_off00011347.bin
002efdb5e987535e3cd2328d3a19ceae01613b87743acb0405f14fdafb2eee3b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11347 18664 bytes