Malicious PDF — malware analysis report

Static analysis result for SHA-256 ace90dc003aa658d…

MALICIOUS

PDF

92.2 KB Created: 2021-08-22 04:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 9233a1eccb033979739f08868fee676d SHA-1: 07251d49fcc3d38e6f83580e0ad952c8a144b6c0 SHA-256: ace90dc003aa658d85e3e3bf13e35b7af665eb556a7cfad2c28b51b9ad96f0b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that form a link farm, many pointing to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://queure.ru/uplcv?utm_term=microsoft+office+professional+plus+2019+free+trial+download PDF link annotation
    • http://thinhhoanggia.vn/Images_upload/files/pevefilub.pdfIn PDF document text
    • http://mega.kz/media/upload/files/zavamavo.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/difobakoz.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9648d72a0---zedojexarutatelotej.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/4709080098.pdfIn PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/nenabobevi.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/20001463091.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/10862882636.pdfIn PDF document text
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/a66a3f285d60a33e7616b1fcd47e1776/46377843026.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/2ad4a54007895224f68a5ee370135548/49983091102.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/9fd58cfb869b4c1e9cf31ef85e2935bb/96978381599.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/9533jq1jt7u20n27gbjiftqpk5/5846336327.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/nukozu.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/896ff0108ff3bf903af25aea6cd77c39/delezikafivovezaduju.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a160412d05a---fejufumud.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/85711812186.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/jurulef.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dabac72141b---wovenub.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/vozuwenoge.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/91065591572.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160705190a6056---96237344289.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/23383450036.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a0251c53689---9674088023.pdfIn PDF document text
    • https://angkalaris.com/contents//files/judubogelavunozedetorajix.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF344 19720 bytes
SHA-256: 0fb33168f271d1d6532f0f65a057b0a7e123afb784ea12d501b8d288a67c193d
font_01_sfnt_off00012513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12513 11256 bytes
SHA-256: 2d6e1feaf3c8967b2aecf8bd7a7fe746ec6755231aabbca363cf21049ad1b4ba
font_02_sfnt_off00013fbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FBD 1732 bytes
SHA-256: 5b3c947262022625ef2d4cfb2d0fa10a94f23c97611fd4c7364bfcc62a76ce6a
font_03_sfnt_off000147f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.