Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad6f2e0ed49dd0fb…

MALICIOUS

PDF

72.3 KB Created: 2021-09-27 04:00:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 73694c26cbddf9d7597cf7de14f58760 SHA-1: a2098ca54077b8d2e4f77654bdcfb716ff2c994d SHA-256: ad6f2e0ed49dd0fb490caf68e610963078c3a2530c67f4744b451dc4c4abd2b6
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating a strong intent to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious content, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to exploit users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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=instagram+lite+dark+mode
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/rulabujaxaz.pdf
    • https://playindiano1.in/ckfinder/userfiles/files/74131556065.pdf
    • https://trystsalonri.com/images/file/95387513476.pdf
    • http://etnorom.hu/pictures/4577039857.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140ebeea7910---zaxutiwamasiwiwob.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614e8d5b08bc0---50693344149.pdf
    • https://hoangvan.vn/wp-content/uploads/files/vemofazezimariwuzidu.pdf
    • http://fipjp.com/userfiles/file/pakafitujaxiwukexebuxeju.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132bdc987a18---7443981835.pdf
    • https://suprizpin.com/calisma2/files/uploads/xamogemunosonog.pdf
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86632013831.pdf
    • http://parcroyale.hk/userfiles/rirujixojurupoxag.pdf
    • http://apple888.vn/luutru/files/41129558509.pdf
    • https://davnosti.ru/upload/rivomam.pdf
    • http://appartementslisa.it/an3_Uploads/file/jerudefumil.pdf
    • http://bsa-billiard.by/images_from_html_editor/file/74029625522.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614ea4697ec69---80308407799.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/f4738b89f3d92390a30f5dd61c016692/68022420887.pdf
    • https://marcvandewiele.com/userfiles/file/satumabomutikijodariwum.pdf
    • http://kredoteka.ru/uploads/file/37845968076.pdf
    • https://shoppingplanet.ro/ckfinder/userfiles/files/16946729003.pdf
    • http://tutek.eu/userfiles/file/mirikojedowinesipeki.pdf
    • http://osteriailgalloelinnamorata.com/userfiles/files/87658190311.pdf
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/kukiripido.pdf
    • http://www.egymast-segito.hu/uploaded/fck/file/77842386214.pdf
    • https://global-brand.net/userfiles/files/losirunarikopel.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_off0000b5b2.bin
db27b14a708a3e12dfe6326e25b9c8e647c691b0b35f683a3d7ab4989f86069d
pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B2 17424 bytes
font_01_sfnt_off0000e210.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE210 16792 bytes
font_02_sfnt_off0000fa27.bin
65ca3fc2aa0ec30c7d9f0391c5ad125db1c626c8ec6afebec1861b6cb97023be
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA27 10636 bytes