Malicious PDF — malware analysis report

Static analysis result for SHA-256 851860ad7ad88fb4…

MALICIOUS

PDF

89.6 KB Created: 2021-08-26 13:11:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0d611812a61115f2b69fbd9a919ffc0b SHA-1: 218b53551c5592f8e06943a16287dfb7b1e1d7e7 SHA-256: 851860ad7ad88fb4a435cd65f0e4f3f3cfdc3a913d35391319248a9156025b88
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV also detecting it as a phishing trojan. The file contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate that the primary function is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://coretry.ru/uplcv?utm_term=the+pigeon+has+to+go+to+school+pdf PDF link annotation
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/45992756782.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021071811134073499.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609516d039bc5---lebedosakomozodilosoram.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa7617fa18---masak.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/pedosez.pdfIn PDF document text
    • http://kbchina.de/upload/86049047944.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160869f6fa4756---gemow.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609574fa108ef---1148578948.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/nuxujenafisibimizesosu.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/wazewesavatefirup.pdfIn PDF document text
    • https://hgb.se/filer/file/vusegofenilijoripumewegak.pdfIn PDF document text
    • http://investgeorgia.ge/userfiles/file/22691528219.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/660etsmibl4pifkkggi8ii2886/26729665210.pdfIn PDF document text
    • http://salkim.com/userfiles/file/kumigag.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/t6frcgdhpja33ft2ogjkorsf1t/55857546008.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af891c5aca3---74664456562.pdfIn PDF document text
    • http://spoilersmensgolfclub.com/clients/865201/File/tifamenazo.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16087a7b1783e9---68816869785.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/cdf20e07369c55c19f74b7769df9efe7/59388124098.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/50469463727.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/20450607096.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609479bd3f906---walupagoganepepifelu.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/jakewav.pdfIn PDF document text
    • https://tipresentoio.it/images/file/45880802694.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/gasipitu.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_off0000e1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FC 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_01_sfnt_off0000f741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF741 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F58 10760 bytes
SHA-256: f1d1b53c1643406338cdaa8296af0ab519d9eb770f5bfd289865c89e87910d26
font_03_sfnt_off000127d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D4 17544 bytes
SHA-256: 5ebac7f44e5a5539b50a63fc349d50e59b4079d2d7d219efdc80a1bf1f007b59

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