Malicious PDF — malware analysis report

Static analysis result for SHA-256 12549c14c8790a30…

MALICIOUS

PDF

78.5 KB Created: 2021-08-15 06:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 945b261124dc7f4b56f517321700d72f SHA-1: 7560c0058b1d8409747024be3ccea7565a423eae SHA-256: 12549c14c8790a30ecc81e0ef45f04f20f4912922d22a070bcb68bb16d45d0c7
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicative of a link farm used for SEO poisoning or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a0279ea5f05---25143266185.pdf In PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/aamamflff4dbmfn5of3jv2t2ra/69872670854.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/37171148696.pdfIn PDF document text
    • http://alcantara.cz/data/file/73560667210.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/p5gvjt3f9ng5blli95doglu1gl/40708210424.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/38225855364.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/347e8ed68793faa73259fea53efb858b/riboditebuzalim.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/c9f6db33bd3df49b2b13b23cf3a81029/disasazajibobetosu.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a07fa568f---nigiwar.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/bafajavaneginigonude.pdfIn PDF document text
    • http://www.olivier-frey.ch/user/web/file/zasukofetun.pdfIn PDF document text
    • http://totoumi.jp/upload/file/15992455914.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/wajedomibibamuxix.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///19504740360.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/wikutugovuxajasilopawiz.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/9185372216.pdfIn PDF document text
    • http://dzbnf.com/upload/file///lutorofigiweka.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/2563nbsr72s5s8dv5v8m24389p/tadavifidisig.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/suxujosaroza.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/eaca600993e906a8795aa70eeeab9689/gepixajadejobobutax.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d14254ad2---42653218669.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=benfica+tv+em+directo+online+gratis+hdPDF 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_off0000cca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA3 11040 bytes
SHA-256: 80e5a18a05fe27082c04bedbeecc48a3d770060253b105483ad765fccbe82e51
font_01_sfnt_off0000e5fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0F 18816 bytes
SHA-256: 812ac6ffb69eccccc88087da436e9ef7c71601cf58ca3f653d8b28e948f5f9d6

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