Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ec20442b6ffe257…

MALICIOUS

PDF

82.2 KB Created: 2021-08-25 00:57:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 951f4b28566eb6e8e5710ea3264d49cd SHA-1: 0e4b2d1caff6810cf759063937d0745a98fb39c2 SHA-256: 4ec20442b6ffe2579c18ffbd943e83efe4e3464608fe38e6b718b166562c102c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various websites, many of which appear to be compromised or hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious link farms designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://pistant.ru/uplcv?utm_term=document+number+ny+license PDF link annotation
    • https://rivieresoceanie.com/ckfinder/userfiles/files/bufizukafirag.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a123b544e14---37524575678.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/nejesuzudasifamixa.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0f2c60fd99---67781588017.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/rifarawokakinex.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114d104327e5---dawol.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/e50a512fee9a7e1a4b77545e8295d1dd/zinewef.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f3227e329---tapimuwowe.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/74a58944116bdd1138418350fa921b31/wajulipisarigunu.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/jorivoxopamijufekoli.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf0dd99e11---zevedatutuw.pdfIn PDF document text
    • https://tavio.ru/files/file/duguzevugajisojatisuziwe.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/gorobavebozevarefod.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/0g6jup8u067g9tiv9ks92ss326/90448445967.pdfIn PDF document text
    • https://chineseclothingonline.com/File/gafofarabumalitot.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a86788648d7---mumutuxeduzujivo.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e6f986331---11485567696.pdfIn PDF document text
    • http://builderall.info/userfiles/file/banimeku.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/83107320667.pdfIn PDF document text
    • http://giaydantuongphongngudep.com/images/news/file/genaz.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bcac1f4acf3---89882924468.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210625200712.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/3415583605.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2653dd048---mumaferuvezikanan.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/14750511623.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_off0000e0a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A5 16020 bytes
SHA-256: 55b9e3e8979186d7bfbefbe4cc3cf31a1547e41c053e32efd1a65ab99202e78c
font_01_sfnt_off00010a32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12249 10584 bytes
SHA-256: 01fe2cd008bdce0d74a54d1795deef96e0463b48d166d33c9520a8b9ed841045

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