Malicious PDF — malware analysis report

Static analysis result for SHA-256 85c17601eaf63a0c…

MALICIOUS

PDF

88.9 KB Created: 2021-06-25 23:10:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8f7f35983c1aa1ef88e535978303ec90 SHA-1: 04b9b3e50a614db744ca1dbd363a18d4fc30300a SHA-256: 85c17601eaf63a0c418c449a1d3a70bdcd21bf9e560f1de00079cccc0187ac69
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. It contains a link farm pointing to multiple compromised websites, likely as a lure to download further malware or redirect to phishing sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a non-clustered link farm on disposable hosting, suggesting an attempt to obscure the final destination. No scripts were extracted, but the presence of multiple external links and the link farm structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://lukoilmarine.com/ckfinder/userfiles/files/badapakobikagatusanosaze.pdf In PDF document text
    • http://mousike.it/img_ins/files/73614450706.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/q9oih1hu75te02lusmk171fkum/42439376088.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1607f86d39ba2e---76218106010.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/q38fqsi9i30t9sl11faincoe22/99971028522.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb7f6a5ba8---faliluti.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/5vcik1tqt7qaj9l2gj5s1pnabp/91086971072.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/41577819413.pdfIn PDF document text
    • https://berbagiangka.com/contents//files/dujaw.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160947af5496ad---funesarorunuze.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160abaf52329a3---jepav.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a26a33a0ef2---17304261579.pdfIn PDF document text
    • http://instandee.com/Images_upload/files/75957521578.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/32365250297.pdfIn PDF document text
    • http://bakoca.hu/files/file/tuwewusimefisifud.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/rv3lv32b0bghnhl9sk2bp785u3/58266446881.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160823a9771a52---71983219631.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/kejuve.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/bizugarofekomi.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/949b857726311c80c5708162ed497322/9284805372.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/zeziditiwasomo.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/qlvnlfniicjpv57donpmcn7u10/sobarunaxof.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/4157f95c83fcf06952933815cff160f0/56718879478.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/qdkv1fkmrn4r9s4v7u2v9vcf16/wufafovolukenajuli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=pirate+of+the+caribbean+2PDF 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_off0000f6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B2 18228 bytes
SHA-256: e681cad0be439d69c22abdd021d2c79652fba4c8af01cb47fd1ccc6f72abe3b0
font_01_sfnt_off000126d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EE7 10480 bytes
SHA-256: 27321f4f0ecae51e0a0820e6c3045803dc1de9b7f446bcc784ebe7b0c0ea7781

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