Malicious PDF — malware analysis report

Static analysis result for SHA-256 599b43d3aebe787b…

MALICIOUS

PDF

87.7 KB Created: 2021-09-03 02:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 946ca3414d1b883d6daa854d38b072a6 SHA-1: 5548ef13af4315a2a64f74da88040f2c024eb746 SHA-256: 599b43d3aebe787bd285f7aeb0b0756b52a1d26372d5aef7f0ef5bc570f4c6f1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=types+of+angles+worksheet+tes
    • https://binarbaidrealestate.com/public_html/userfiles/file/pesupekifakonibararifane.pdf
    • http://adbrf.com/files/fckeditor/file/114961424611c95e12e6e7.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/054f67350bf437bd2d9b5b5bf2e5f3aa/dogusuz.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/j5fmqu86machpq6li4mf4c0smn/29890052322.pdf
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/ratizugegemos.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c888912c29---71307878026.pdf
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/redas.pdf
    • http://ximangsongthao.com/app/webroot/uploads/files/2036735147.pdf
    • https://regiefranchet.fr/userfiles/files/jilobimifolixogedi.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612bba2d349a0---bovifuranamifi.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/s8a6ug3blsf0f2cloc0235rc0e/tetamot.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/d6ksole794bek3bvgeaa8tej87/dovuxosem.pdf
    • http://www.fishandcosolicitors.com/uploads/files/49122676778.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120369947a15---68066726446.pdf
    • https://sahodayabbsr.com/test/fckeditor/file/fixozoda.pdf
    • https://geneolock.com/locktactyuma/userfiles/file/miwifilezubirukuvobarala.pdf
    • https://mamotato.ro/userfiles/file/45465628388.pdf
    • https://najlepsze-w-polsce.pl/uploads/8419541974.pdf
    • http://analogsys.com/uploaded/file/366427842608c0568c3521.pdf
    • https://khabul.mn/mmpa/userfiles/files/60699110047.pdf
    • http://barrospizzadb.com/uploads/files/mujufepibe.pdf
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/kizugewis.pdf
    • http://jnnycc.org/userfiles/file/41502275840.pdf
    • http://skyline64reunion.com/clients/e/ec/ec378541aa9b73e2b99de5ca5545ec21/File/xinimakudamasurel.pdf
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750d86383f5---sotevoti.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_off0000eddb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDB 16792 bytes
font_01_sfnt_off000105f2.bin
84f171b32d3abd67e14a7124c74adbc5e7771673d6df1e8745ee02ac5e5eae86
pdf-font-stream PDF embedded font (sfnt) at offset 0x105F2 10800 bytes
font_02_sfnt_off00011ef2.bin
5bf7d6cc95ed653f0ce225fbbf5d89a03759c5cf442c9985e7d82a953797ffb8
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF2 19488 bytes