Malicious PDF — malware analysis report

Static analysis result for SHA-256 87ddef39faf94bad…

MALICIOUS

PDF

81.5 KB Created: 2021-09-19 05:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 53bd72d7044c164686ea6153fd0dd894 SHA-1: 942512dfd1bf16bb39a1ade152e3d2387d0117bc SHA-256: 87ddef39faf94badc26eeff12fca3ed0504ffd32ee28c93a9d56bd5eb148487c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://infrive.ru/uplcv?utm_term=trainer+of+monster+collect+and+craft+mod+apk PDF link annotation
    • https://www.pharmawell.eu/ckfinder/userfiles/files/kawisipakonekem.pdfIn PDF document text
    • http://contelex.it/userfiles/files/59883770119.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/71856998562.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/ridobovefo.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/jibitebalarogegajisu.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210905/210905155833632464e8uug5f6fekt.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/ed2352769d8e48374a69516b71d170ac/kuxonomuvewidakofula.pdfIn PDF document text
    • http://wacommerce.net/home/integrity/public_html/ckfinder/userfiles/files/xozapoziloxanebobax.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/46113521846.pdfIn PDF document text
    • http://romanasulcikova.cz/userfiles/wexoxebawasiwikesajev.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/a1cf95e17716dfc5f4d5419b028e6ba3/tigazugidafubiwamikuxaj.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210910231246-topeluparokoni.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/74970480788.pdfIn PDF document text
    • https://xnkvinatimex.com/uploads/files/jutibagupomumekemogapuf.pdfIn PDF document text
    • http://thamcohoaian.com/webroot/img/files/54224474303.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/sijuduvitativarifidew.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/noraxeda.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210919071504904.pdfIn PDF document text
    • https://apra.pl/files/file/14799826160.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff7868b518---navidegolasamowebugulaka.pdfIn PDF document text
    • http://webs123.com/userfiles/file/zofukupujipibemadato.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/27279005392.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/161449fcae6ae1---42221280691.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_off0000d3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CC 19580 bytes
SHA-256: 57f37b1bbce6c4d3af7a3be9c98eae145064a407b24f01d0bcf19d4bc2831cce
font_01_sfnt_off0001075c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075C 10836 bytes
SHA-256: 41a7fcac0a50f3a6142247e20d235288dc394475bbb18e7b115a41ee26c6629a
font_02_sfnt_off0001205a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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