Malicious PDF — malware analysis report

Static analysis result for SHA-256 c73be6fb98444c92…

MALICIOUS

PDF

82.2 KB Created: 2021-09-09 13:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 24165e23058b73fd779034593324d6ca SHA-1: bfc72ed2c3218a69a82edd295a05686fe9f74cf6 SHA-256: c73be6fb98444c924df7316feb8a24a421fecd1530758b797bc6575af5867075
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The 'SE_CALLBACK_LURE' heuristic specifically points to a callback phishing or tech-support scam pattern, where the document likely prompts the user to call a phone number. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs, many hosted on potentially disposable domains or compromised CMS uploads, suggest it's designed to redirect users to malicious content or phishing sites. The primary attack vector is likely spearphishing attachment, with the PDF acting as the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://goozzl.com/userfiles/files/94786062834.pdf In PDF document text
    • https://condicionamentofisico.com/arquivos/file/pisafabetedukitil.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/fusuzevofaxelami.pdfIn PDF document text
    • http://samtle.net/ckupload/files/binawosafimififa.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/fijetix.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137bc2fdf5de---taligejixel.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/22667415185.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/64298243085.pdfIn PDF document text
    • http://ccshecea.org/upload/files/lisatibep.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/45369992996.pdfIn PDF document text
    • https://weldingportal.it/userfiles/file/nusorijixororedov.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161353ac929c1a---dipemafulinipu.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210902075823.pdfIn PDF document text
    • http://szhlfz.net/upload/lagakeraxubafewoki.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/17311370332.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/zodafaxonujusazo.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16130543a442e0---21249169909.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/77464209559.pdfIn PDF document text
    • http://marketingnews.fr/images/file/zewevi.pdfIn PDF document text
    • http://www.serenissimaservizi.com/files/jedudatuluweno.pdfIn PDF document text
    • http://infosierra.es/images/editor/87999201231.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/32977795539.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=moto+g5s+plus+android+updatePDF 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_off0000d8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FC 18800 bytes
SHA-256: 6a3512c5345e389d657a283664fe18d0db1ef35be4802f2a05d307b1f40738cf
font_01_sfnt_off00010a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A28 10792 bytes
SHA-256: c86ef3f2e4faf2a395135e04a9fcd6892419569780efc9e61365180a36a09aaf
font_02_sfnt_off00012301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12301 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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