Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cbbee0bcbc132a7…

MALICIOUS

PDF

73.4 KB Created: 2021-09-07 23:14:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 3340bd2980531065c021e1d93817a1b4 SHA-1: 8782462509d3e831fbca9e05a29158ea10022b59 SHA-256: 6cbbee0bcbc132a7b9a8a3dbf19961698a478098d518dbb47f94287edc55a4a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to phishing or malware distribution sites. The presence of external URIs and a link farm structure strongly suggests a phishing or credential harvesting attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://allytemp.ru/uplcv?utm_term=dermatite+atopique+nourrisson+pdf PDF link annotation
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/e9de3d2d870bee9954d195f5545345a1/62687822285.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607843ba66fb7---tulodunizeze.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/59145763777.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a97ab758908---80650162199.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a55b8e85a2---84908919470.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/98568598344.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210727184746_1281435535.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/26835704960.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/dodimu.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/e4070ad27269c98447b1f664511db79c/78306795659.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8ddb454cf---93183385178.pdfIn PDF document text
    • http://pasaru.com/upload/files/28812873515.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608536c442450---bibodubajutesuroxisafabub.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/63831763668.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/vuvigavedipujud.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/3otcq2o77lel8ko89qm7ohe4ar/lagopurutekite.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b6054a340---xefasigedewabedis.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a2dc4c96007---dukologakipegexade.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/1obt0bvlkjdc47376l8ceaj32p/tofoxixu.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc7a89075f---45183256973.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/23128431640.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/ruwurupomimafodoka.pdfIn PDF document text
    • http://surtek.biz/image/files/20150219_105607.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/kulewa.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_off0000be08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61A 16612 bytes
SHA-256: f1e6df82c5311eb47dc133197f2771c655c8183d0c74b3f0876230804b441f07
font_02_sfnt_off0000ff01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF01 10860 bytes
SHA-256: c2e72b5809715e90a09b12d05f85e7f35273218cc5f8d5ca0b2f32d3100ff40a

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