Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb4a234ce55fb39d…

MALICIOUS

PDF

76.9 KB Created: 2021-09-03 06:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2870b93a59ac2dddb8f5c6db5d26247d SHA-1: 4387d627dd533237016745fba840a34bf16fd10d SHA-256: cb4a234ce55fb39d8c987ad12c75f073f1642ae561749f7a76f2cd2bb810096f
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. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm for phishing or malware distribution. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this, indicating the document's primary purpose is to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=autodesk+revit+2020+structure+fundamentals+pdf PDF link annotation
    • https://elearning-chemistry.ro/userfiles/file/nomaduzikexideximafux.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/8107954519.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/pivuleneziluzoduzaz.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/rununuxijadafuj.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/jonabomiwigure.pdfIn PDF document text
    • https://dm288.rs/slicice/file/sumor.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092618336af6---goruxalunokovojizojeg.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/5c1f9dc4175176dba38b1ca114d52f5b/zofepalafekizitub.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16080c6ebc9a82---kakoledutuzenozajaka.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/5b65c36872f38b333248a8a42f51660a/53213789532.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/rubojobuxubumuxubul.pdfIn PDF document text
    • http://emeraldoutback.com/clients/f/f6/f61299a274fa8fdb0c00f5b1ed511d42/File/55352481205.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/20518435804.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/c874e9e3d646acf3c8d3c65061decdea/jeliwijatororaxe.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/56400616524.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/32067239c42f1e62bc1934ac3a8bde22/9323810803.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/43556722678.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/51186570588.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/4440528633.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/zosaxotenizo.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3cb7b3e2a7---76063194708.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/waxupajeb.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/qfl1kj53p077i1hbofd9nj654j/dedawijumosedipavimajuga.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_off0000c8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B4 11264 bytes
SHA-256: 9061d6f7114a7e2579487ca976c4821d57a8d5d56a6b17d16d61ddf3c929df52
font_01_sfnt_off0000e336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE336 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB48 16588 bytes
SHA-256: ca5eec707256e32c73bec2111f6ef6a36c5feac3483fc784bb5220e5595e3294

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