Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f2b92f955be6fc2…

MALICIOUS

PDF

80.8 KB Created: 2021-09-05 16:56:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d09352732f43aac94ae03b37b1ba8bcf SHA-1: 393409b0cb8ccc6d96d46e281398e367de1ca983 SHA-256: 8f2b92f955be6fc2ad4641595f736a65673adf210b854bbee48bfaf946f3e525
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised websites that host other PDF files. These linked PDFs are likely intended to lure users into downloading malicious content or engaging in phishing activities. The presence of multiple compromised CMS upload links and disposable hosting further supports its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca6c7848e0---46505133763.pdf In PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/98177298165.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/d9aae376d80836d9718b5d08fe3f1214/6045055830.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/66j443n0gcp4m6s6317ua1io9u/safuvuzitelaxavit.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/8219450985.pdfIn PDF document text
    • http://skikk.nl/app/webroot/files/userfiles/files/14108789368.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/volesefesubanug.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f672886fc---40515344807.pdfIn PDF document text
    • http://veivel.com/userfiles/file/zixasarakufamibu.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/nosur.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/h9hnr2nha2i79luvu78sus0h1r/12464116396.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/dixapilenuxukiruxebux.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/65762349428.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a11d2690f84---91232497671.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c4e4ce879---66514925431.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/3c174d9e743b98de9648299918d3a931/repanepitaluvife.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/xideduzevonijore.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/hkovg0gkvpejs7i8vifpe9l2b0/fifutijiliwodekowipuj.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/tapulosabi.pdfIn PDF document text
    • http://strandedtattoo.net/file/vitokejisojefuzatota.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210803075443.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/rowonigujawiga.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/tijurakiroron.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b895bc8ee08---kamokevofimiwodasawes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=structural+geology+1st+edition+fossen+pdfPDF 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_off0000d878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD878 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f08f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08F 11136 bytes
SHA-256: c5c2390606481b7427e10748aecdcea07a90c9a1f02a3d39062f6642b1f34e73
font_02_sfnt_off00010a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A81 16656 bytes
SHA-256: 531152b5d98ee5c3db239864872ecee20af797f78c906b18cce306fa150f7599

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