Malicious PDF — malware analysis report

Static analysis result for SHA-256 10824903adc41e14…

MALICIOUS

PDF

95.0 KB Created: 2021-07-13 20:04:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d34bd341c356207b73edfdce819a1ff1 SHA-1: 4eae94b5538f0c414c07a84556b45cd5a63d1a77 SHA-256: 10824903adc41e140a25ab71ccbb1b68876f471cd601532f111aa0dbd396fa60
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting. The presence of multiple external URIs and link farm heuristics indicates an attempt to redirect users to malicious destinations. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://vntdc.com/upload/fck/file/kolazabazaxofuxadexomeril.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/cg31512juqt0363k4442gi5aum/pisudipenanabuv.pdf
    • http://ccsl.asia/files/pizososeziw.pdf
    • http://tortsurprise.ru/upload/redactor/files/dagoli.pdf
    • https://medicentrumnz.eu/medicentrum/files/file/padazawisu.pdf
    • http://www.ecvbrass.ch/user/web/file/fivajilujamojalaxuwevo.pdf
    • http://riskhedgetech.com/uploaded/file/146842541260d62ac040dcc.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d31eb48e351---kinokizipov.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e379c8dcffa---27983188392.pdf
    • http://baudoinfamily.com/clients/f/fc/fc66627f90e8a365851b026dcf169025/File/71361216898.pdf
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/b36e2ffbe6a4256c52caebc2682a8746/90980224271.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16079379d5a226---19252360597.pdf
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/ketotawuborejemekogabuput.pdf
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/bcb1fd232f3cb3afd91f7672ff1d0a53/nuwolujatepakagor.pdf
    • https://myclubowners.com/userfiles/files/lanineme.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/6ef2e9df6c185652583b66a328e7b607/4152761850.pdf
    • https://almondzwealth.com/administrator/imagetemp/file/zuwizalitidakixusek.pdf
    • http://thrifty-uy.com/files/others/jawalifutubusuguwezazavit.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608e40acf193e---xifevixefuzule.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b41565b74---65021247885.pdf
    • https://bazab.ru/ckfinder/userfiles/files/xisugezanepopigijadumamuv.pdf
    • https://valerart.com/ckfinder/userfiles/files/dawimeg.pdf
    • http://electrogalicia.com/electrogalicia/recursos/archivos/49836407730.pdf
    • http://brightwayconsultancyservices.com/userfiles/file/91703247728.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821afb7d698---vuwusatifur.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160988fcab0ea5---jekum.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=school+quiz+questions+and+answers+india
    • 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_off00010f3f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3F 16792 bytes
font_01_sfnt_off00012751.bin
56e76bc01c01769511d8d9e386a1dd451252908444d2dd42411d36d730e7d87c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12751 16876 bytes
font_02_sfnt_off00015361.bin
0be40e0fd12d7109d77d7e92eef160dbf5ff767ed2f583b06d077f5a02bad15e
pdf-font-stream PDF embedded font (sfnt) at offset 0x15361 10932 bytes