Malicious PDF — malware analysis report

Static analysis result for SHA-256 49be67931bca0eca…

MALICIOUS

PDF

89.6 KB Created: 2021-08-17 05:07:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 66b7c97eea0ce86692a9f9054aa1cd60 SHA-1: 909c3f2928b719117ae27eeda80857cb7d2c9f90 SHA-256: 49be67931bca0ecae5f307d15fce7aab1e2d18f91b1f6027b72ccc50badfe430
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, indicating a high likelihood of malicious intent. The heuristics reveal it contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites used for hosting PDF files. This suggests the document is likely part of a phishing campaign or a distribution vector for further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ketchas.ru/uplcv?utm_term=perguntas+e+respostas+de+cultura+geral+angolana+pdf PDF link annotation
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/f8ocppcr0bbiht44rp3em97cpk/41118470759.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/c093758d4902ceddcaea0917a9b3aa13/xaxirowufekovifasuze.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/zamuvakumaberodatoxegi.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/f9b8836075a624428a5ff56b6f357381/36164119116.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/gilit.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdc5e8214cc---41454248162.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/ef88de61c8cf52113da64dee7566c6ed/17518997328.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/82240539493.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/e91d7c1430edea44490a7cdbe0a74966/dunanefajupuvafum.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/65567481599.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af99cec2935---fuxasap.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/58152013780.pdfIn PDF document text
    • http://czyxchem.com/upload/files/81324078050.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/47679925612.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/74062190109.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/pewukosinof.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1610f048c99ec4---xanopamutezovuj.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b38c04de9fe---pewiniboxu.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/85463314659.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/88091dbb271736ca5c7ff34687100f23/684166962.pdfIn PDF document text
    • http://painttechvina.com/webroot/img/files/dezobojorita.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/belukexelele.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e9f5ad502---59128770121.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/xewefigefuzatomoro.pdfIn PDF document text
    • http://compsult.net/userfiles/file/85757207641.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_off0000f23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A50 20744 bytes
SHA-256: 93d670eff29c8f7191f694071980cf712e67e02c37a067565c8a7ee12e977f41
font_02_sfnt_off00013d8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D8A 10804 bytes
SHA-256: f9ba0ef3e67f0b0ad50dafa13b6b6f77da855388744092cac61f29b0c3991220

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