Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d15cc8b3e410f1b…

MALICIOUS

PDF

75.3 KB Created: 2021-09-15 06:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 943eae75758f1a934ce5b8ca6a8adfa4 SHA-1: d180cf8080a9ff6c08481cedad1b33a83dd1a111 SHA-256: 4d15cc8b3e410f1bdd51e7e4fd22869a21925650a5341b41fd87f0beb517a4cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on compromised CMS upload storage or disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://garglob.ru/uplcv?utm_term=baseball+clash+mod+apk PDF link annotation
    • http://simsvizag.com/admin/uploadedfiles/file///negegibixilodalun.pdfIn PDF document text
    • https://eastmangroup.org/ckfinder/userfiles/files/favamasoxiwosuruzerow.pdfIn PDF document text
    • http://dsraxys.com/uploads/wopokezadinonodonaferukup.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/xebegujijevetiledi.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/wulekolipadajetefodaja.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///fisugulijokif.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/80940352110.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/dogosudeju.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141337d10ee0---dogigiresujedademu.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/gusokepikejimivasilu.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/mivureditukobesoxasi.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/40e34a0511dc6eb4f931af7443c9b984/75283540679.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/vigapudepimaweban.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/sitipadopixafevibopuge.pdfIn PDF document text
    • http://mq-water.net/upload/xujivotiti.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/36556068801.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/pinoneso.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/99786937253.pdfIn PDF document text
    • https://maciejabramowicz.pl/upload/files/file/70875949197.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/nuwilato.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346a1108767---tafimazumajeja.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130133b71d21---32683042202.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/nuvazul.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0A4 10668 bytes
SHA-256: 7c5d718ed6cd1a8a208224129bc396ae1513cfd09ad942774c605b409c652704
font_01_sfnt_off0000d8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E5 17924 bytes
SHA-256: 3adc78217b4a49c315aa76023be2e3fcd3c0a4ed92e55d8e43e1c5064d1093e9
font_02_sfnt_off00010774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10774 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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