Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee24c143c9c945d5…

MALICIOUS

PDF

102.0 KB Created: 2021-07-15 12:14:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c8375cddab446a672948d5e3c9a2e386 SHA-1: 30f02f2cf596ac2fed1f14dfeba1d2267237a972 SHA-256: ee24c143c9c945d5bea96287083dcc8ade402a672f0f4c4a3a98213cd4f61388
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of multiple suspicious URLs and the overall heuristic profile indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://laborke.ru/uplcv?utm_term=phase+2+marvel+movies+in+order
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160d3dc7ba0461---2131700750.pdf
    • http://feynburg-uhren.de/uploads/togovavojuxurago.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06a8370565---93772908348.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/bo57v4tg7c6taqpn2o9l8786d5/bopapunepeva.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/a320b8d6037939017ae535a6487eb557/94903356453.pdf
    • http://tecsun-moscow.ru/docs/file/mumodalozuxivemu.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/d985278f3ad1ab7a792ddb91788a4270/95279820340.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/22qc7ieraok1c7pcj2p2blvhq3/lovojumiziwuxazuloj.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/472f8cfe741aa30f38677a3ccba069bf/fitaliweris.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/217ec9486b179943a3b790cd9ec52bc0/81341092813.pdf
    • http://camionespanamericana.com/userfiles/file/beturelatifavapefawil.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c269f541b4b---zopawadajotavemefapovo.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160953b8b37e75---sevavex.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca5fa005035---87258214922.pdf
    • https://ivanda-commerce.hr/userfiles/file/30254579452.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b956c48ffe7---tavogisowakikuxiledan.pdf
    • http://www.urbanwaterways.info/files/39640904709.pdf
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/7b7f8848ffa50bfd593596e01d97380a/85226285587.pdf
    • https://gifarlcm.com/upfiles/editor/files/76133413252.pdf
    • http://agarimo.com/archivos/archivos/bojoboduwemin.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5e8a80736---68821037009.pdf
    • https://edusfera.pl/upload/file/godiduvabanetosenuxamadi.pdf
    • https://birudongker.com/contents//files/vozowufunodoxosuga.pdf
    • http://kengosushionlineorder.com/uploads/files/jujizuzedilewidinaj.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/gsoeijgva5ls30a393s6f0b985/16978809136.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_off00012e4b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4B 16792 bytes
font_01_sfnt_off00014662.bin
9f129644948bf6e0153a16589f30667fafbf05e22da37009668c5db39e4d0210
pdf-font-stream PDF embedded font (sfnt) at offset 0x14662 10604 bytes
font_02_sfnt_off00015e6b.bin
b92d7bfd166acd16957cfbe642df427e04d629ec494e1d69650890c3fd955002
pdf-font-stream PDF embedded font (sfnt) at offset 0x15E6B 17268 bytes