Malicious PDF — malware analysis report

Static analysis result for SHA-256 c50f63772d300b13…

MALICIOUS

PDF

79.5 KB Created: 2021-09-05 14:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 130938982d44a4102671afaa8450403a SHA-1: 592112f99240899002639f3f377c76b7308ec8b2 SHA-256: c50f63772d300b133ac7578994d689524ce6d33ea25ca61949a4886ef6a3510d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://chinajnbt.com/images/upload/File/79515963553.pdf In PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa42d0a15e---fuwixinilel.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/40372011938.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/97613086677.pdfIn PDF document text
    • http://danfilenemd.com/clients/67744/File/dewuxetawijajanizup.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/78768123089.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/wikugixebevaf.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/6900933110.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/misefelojifopovusagata.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/14371693372.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/07573a41946781df8c51355f38aa1e7d/fidomomu.pdfIn PDF document text
    • http://freewest.at/veluvebaxubebefakumo.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/6d7e3b7eee21dffca07207bf06d587a5/61395998331.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/purofigogafoxijupebi.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/tirekalomalu.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-8-25/20210825160132502931.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701a4b3711c---meriw.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/kesekuribibulorog.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/buninile.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/moxolujalexapudaku.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3b9e44b96c---fivezuvupiwevi.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/pagujuzinetazodebomed.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/5dkugi4pvemg52co02enibbe8r/50667689308.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=ejercicios+de+las+leyes+ponderales+pdfPDF 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_off0000cf30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF30 18880 bytes
SHA-256: f6996b7ddc804761077a0cf6559d869366da07274fa690a2c114ecc3f5782c07
font_01_sfnt_off0000ff92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF92 10740 bytes
SHA-256: 50a464dc634c0e7e8bb4babccee9da2d3452c337381f15ccf78e8f695597366e
font_02_sfnt_off0001184d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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