Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2692983aa77f02d…

MALICIOUS

PDF

77.7 KB Created: 2021-09-13 22:29:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8dbea0075b4bbbb6242192c7b1b5072e SHA-1: c0682590bf0a898dc6767e71f51b7e8b0c00a040 SHA-256: c2692983aa77f02d906beb0031131d66a5398abe7fb08313487d494efac69de9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm for phishing or malware distribution. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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://1tlstar.com/storage/uploads/files/60492453008.pdf In PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/bcb56de55a3dcda8a1c4929506159461/60542270825.pdfIn PDF document text
    • http://ibnuaffan.com/ckfinder/userfiles/files/nenepolifatex.pdfIn PDF document text
    • https://gencatakan.com/upload/file/93888695687.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/36224540482.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/24827039382.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdcdc9d0c7---57784646982.pdfIn PDF document text
    • https://agros.net/uploads/file/mozaker.pdfIn PDF document text
    • https://f2h63c2.ip4secure.net/upload/files/31509615292.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/pedokosibezasozibu.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/fosodoxefokeverole.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161340b03bb779---2427490939.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/o6pkhrlrs1u2oh33mkvviocav6/wukavon.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/seguwexaradefo.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109010223085315.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/09/02/lirosokibitigumedum.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/bagewi.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/58462698857.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/rurobiretixij.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/nibujovaxujoxejitigineje.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/fefatix.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613db31e09cea---gibovejisajiwuvimakixepe.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/58704943720.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/webelamejozulizu.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/fewikujogufulewerib.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/bopiboluz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=psicoterapia+gestalt+proceso+y+metodologia+hector+salama+pdfPDF link annotation
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ded8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED8 11076 bytes
SHA-256: 7a97460683ecdd301263cbcded6351d3371eda43e4766e4e30e8252b16b36e42
font_02_sfnt_off0000f883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF883 18652 bytes
SHA-256: 3720acf12bfd09787fe4ff13d4dd25b990fd334f656c05b187675f680cec9592

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