Malicious PDF — malware analysis report

Static analysis result for SHA-256 b72cffa3eedf0a76…

MALICIOUS

PDF

81.1 KB Created: 2021-09-02 03:36:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8232fde9210f1cff57e004b93a1b08f0 SHA-1: f53b3541cf07c67d7bbb030451dd69b973039709 SHA-256: b72cffa3eedf0a76861a87c519e0d8743d1ab530b989977e952359f8946cba61
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as a malicious PDF by ML classifiers and ClamAV. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The presence of external URIs and compromised CMS upload links indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://philabc.ru/uplcv?utm_term=haploid+cells+have PDF link annotation
    • http://veterina-hrib.cz/user-uploads/files/pikazepajopofofixajapunuk.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/86808782948.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/62912575151.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/kepuvepizebevi.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/nepimona.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/kewanenisuxavogin.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16074870e168b6---vaboromawazipejex.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/59176198708.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b27b9a3f40b---ninexilerisuwidotowa.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3780de32df---66100338890.pdfIn PDF document text
    • http://ongnuocdenhat.com/upload/files/89623751025.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/529lr5d01ui1db66ienhcumlps/nexob.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1131a02525---rivejemaresazexefubavufa.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/fd6e7de34520f314db8ab2dad771e381/pajofamogezasogulufux.pdfIn PDF document text
    • https://empirepin.com/calisma2/files/uploads/90455967652.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/fjm3n3t9f76ev3j8jcstn1i69c/vebomovojiwixakupezelux.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/getupala.pdfIn PDF document text
    • http://slp61.com/clients/e/e2/e296dcecfd7d10ffef0cc83fef253c72/File/nelotigujuve.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160769208b6923---mikigabigizar.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608744360a5d4---21792861837.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/zozubibalurogupenowo.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_off0000d79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB1 17796 bytes
SHA-256: d2776d912895efbebd458e038c67e3512d4d9806756539b109a43ff0fa40def5
font_02_sfnt_off00011df1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF1 10368 bytes
SHA-256: 2e0cc2efff25dc2b97c2e836db1cb41fed56ccdbbbdc5cd9326039a74a9e32dc

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