Malicious PDF — malware analysis report

Static analysis result for SHA-256 3316d4638407ddea…

MALICIOUS

PDF

80.8 KB Created: 2021-09-08 08:17:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2243e0a5d1a71d25e10690209ab6bc02 SHA-1: 4fd6fbd4b699bedf5e4693ad923a6130c0cabb35 SHA-256: 3316d4638407ddea1c105534b941ef48d5799e59a2b602c799ad151527bb0ea1
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 ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The document contains numerous external URIs and is identified as a link farm, suggesting its primary purpose is to redirect users to potentially malicious websites. The presence of compromised CMS upload links further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=usage+of+would+pdf PDF link annotation
    • http://miet-boot.ch/images/uploadedimages/file/baxunofofujudelivi.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a77da77ee09---85539794830.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b49e45e8363---lekujobanalimelurap.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16071ed9f6159d---71725218947.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/15137667760.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160beb262bbbf3---sapusose.pdfIn PDF document text
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/xivegarokodeg.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/96484508748.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746a76ae0c0---pugoke.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160997aaf5b4fa---wifezulumubuda.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/6506a7420351d9b34c778ef5302e60ee/togububona.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/0ed4960cd6fba96a05472243a8e662a4/11331964142.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/25007715976.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210602/210602183802392028ttcx0pk29jac.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/8m7nnodh6sojgojlemun1jdgk9/46891420113.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/gavuwivelawumafafuwofuz.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/91895453114.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/29622200593.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/votozigobawekepekig.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/xezopiwedewijapamor.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/fapuwe.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc910053d4---55902290657.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d6b4ad44b1f---pubadiliguvada.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/93800126644.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_off0000d6f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F9 18108 bytes
SHA-256: 5ac1532ebfb9a1290448433dbe5fa4a843b17879656997d24f049c98dcd6b84c
font_01_sfnt_off00010589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10589 10472 bytes
SHA-256: 0965dd7b43cd49cb293656d54c4c934f821d0599b9e8c201ba6c54285496f41d
font_02_sfnt_off00011d56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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