Malicious PDF — malware analysis report

Static analysis result for SHA-256 8647674a4e619adb…

MALICIOUS

PDF

85.7 KB Created: 2021-09-02 21:10:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: db8f9533b5a863fe131eb1d7169083b0 SHA-1: 7e518281b41612fe4f4db9b455cf41e32509c2d9 SHA-256: 8647674a4e619adbb94590d4ffababb8bcf05f7eab00fe9359f0a6d8832c4d4d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or redirection scheme. The ClamAV detection 'Pdf.Phishing.Trojan' further supports a phishing or trojan distribution intent. While no scripts were explicitly extracted, the nature of the links and the detection name indicate the PDF likely serves as a lure to download further malicious content or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://queure.ru/uplcv?utm_term=fiches+de+revisions+brevet+2018+pdf PDF link annotation
    • http://www.chatanakonci.cz/userfiles/file/97709234913.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/25cd8b57a9e4ed234d80673005789e30/mozirelidemezam.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/fiwenufu.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/xoligodosadazadegufefopuv.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/ranozixurigov.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/8af8d8ababf8f43bdd96da7698b1e7a3/sixapadumosilazo.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/35308818197.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210614032733.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/v4877kr0mvqi95a1j1tq0t1fj1/92123298133.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/a8bb3fe83f88615e0ebb7abdc1584a14/nezelabaluvosibizobuget.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/69924275844.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4b5036951---61091540617.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/jasuk.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bba879e32a1---16412829966.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/musevukufenagivobudevi.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/pusevok.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089634e2c807---wizufusebuzizaw.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611125035777d---69511077478.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/72s7gasicpnhla3nj3rd63r2g5/kevijopabugafotitilogam.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/28161854887.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/f942537e8977a2b4b8a967fa341744c9/defotibadiwojokinimoxi.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16128c3cd4369f---pipofakofigirig.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/52558698264.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/guligimelukokenamonug.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_off0000e017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE017 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82E 11192 bytes
SHA-256: 143d525cebaa7940a8da8d8b9f79a56b7eebafa3cebbdcfe833d17f1889779d0
font_02_sfnt_off00011229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11229 20964 bytes
SHA-256: d4d008d6c6e117caaa1781e844d8dbd3cd5a3b44b4d8abe6ddc7e4c6d791b17e

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