Malicious PDF — malware analysis report

Static analysis result for SHA-256 93965a58d59dc05b…

MALICIOUS

PDF

79.1 KB Created: 2021-08-23 11:21:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 81509bc2c49d403d66c9456e7cc4ae66 SHA-1: e21ad6cfd91af52e324098c80cb391cac3ed82e0 SHA-256: 93965a58d59dc05b1b354123d4a83d5b589eb442054bb5720f0610aaa22eb959
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains. The high ML score and ClamAV detection indicate malicious intent, likely to trick users into downloading further malicious content. No scripts were extracted, but the PDF structure itself facilitates the distribution of other malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://clumba-indoor.ru/files/files/57911581749.pdf In PDF document text
    • http://massarentearchitettura.com/userfiles/files/jilupopabelexini.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/6104g20nu1u7lst3kej0adgk95/simikosevawugiz.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/011801269202.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161235a5e9ee85---zupiruxisa.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/nasele.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/20024956134.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1623491503.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/25174ff1d47049bca1f170cf6665856a/95883785197.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f58f2ce192c---figoxonavakowejibubuze.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/fekuludofexiruxotupulewuk.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/vijiwofata.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609320f0b4952---xotijupibamepusukafipiwaz.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/xegorufikuwunevovadonod.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/lepulezoba.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/sefuxejudixirebuwazuza.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210808162819_ug2nus.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a94c4a8088d---rikirigujone.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a340164b1---40193859246.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/nofudixufinikunasifarevap.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0eb03f66e---37728826505.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/fuvezowidopeniv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+do+a+calendar+invite+in+outlookPDF 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_off0000d44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC63 10528 bytes
SHA-256: 53dd46df951b8eda83238091f755e6b3a741fe8bff5254f22911a5d32a2a17c8
font_02_sfnt_off00010476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10476 16120 bytes
SHA-256: 57ff2cde35c3d5fa1db9c56cfe907766864f6bf75ef52d5f2ed8470a2e7a4144

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