Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5584f4a6243162d…

MALICIOUS

PDF

93.9 KB Created: 2021-06-30 06:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3f2456d8c69820b133f4bb4b53f7ea16 SHA-1: c4ec3c9a04e0c2c5e540491a098df32c33e6a1ee SHA-256: f5584f4a6243162d7157a3ccc3ee3e400b674b144c4b06cfa735d6a3560cae16
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF was flagged by a machine learning classifier and ClamAV as malicious. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites. The presence of multiple PDF link farm heuristics suggests an attempt to leverage these compromised sites for malicious redirects or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/5fsnb1l31dcs81fuuiq3r0ar95/12104905566.pdf
    • http://tuning-zone.eu/userfiles/file/75095198289.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e530c205fb---48013659076.pdf
    • http://gld-lining.com/user_img/files/69050786325.pdf
    • http://vietkinggroup.com/uploads/userfiles/file/mopuxuzif.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/ead89d5ef0ab0fd578b19529dfcdeb7c/mutadanafob.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dad3305daad---jagom.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abfac295151---direzofemigugej.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/da947ff02b096e93e4be8344eb2ba1b0/59870950320.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b6e4991fd---tesuwesofawumufipijekad.pdf
    • http://dentish.ru/ckfinder/userfiles/files/vopetenufilewasem.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac905b5cb80---wajefabubavod.pdf
    • http://anandamsanyal.com/userfiles/file/fakuwalisusapilufuresawub.pdf
    • https://consultingexpert.eu/fckeditor/userfiles/file/sinozaxakaxopofunun.pdf
    • http://botosani.ro/img/uploads/file/jidisugigodesitora.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/64151034c0e8c8f01b3c01d6acfb35ac/12690658727.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/71bf5c187817cbec8f6202c31a8f8124/2716159027.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5da93e549e---rakamulexobon.pdf
    • http://bscartridge.com/pic/wexerujofotupukadedef.pdf
    • http://mmckno2010.zkosuchdol.info/files/pilasimemiweri.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/ab5172ca656081bba00f90431c2633c7/64129423307.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/fd9def5b345c80f6c659b421e351a700/65116818102.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160842aa9b7499---xaluwijijubo.pdf
    • https://horizontire.com/userfiles/file/55774648937.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=capacity+in+parental+authorization+form+oci
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4d5.bin
7306ed715886db9355e329b641cd1eb65dff27ad742147018809e578ced60d9e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D5 10880 bytes
font_01_sfnt_off00010dd9.bin
5cd8a120e106fc2d4fc1855603a636a3ce922decfb1b4d98f17a4a5450337c58
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD9 16344 bytes
font_02_sfnt_off000123ce.bin
7125121846dab9ffe672d1b7593aff97faaca34fb70919b4d9d0e6a86bcf4b70
pdf-font-stream PDF embedded font (sfnt) at offset 0x123CE 17576 bytes
font_03_sfnt_off000151b6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x151B6 16792 bytes