Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3d04acd22f7593c…

MALICIOUS

PDF

80.7 KB Created: 2021-08-01 09:41:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6990a33374ffa1c9ef5125de9ed511ff SHA-1: 81334c2905bcdbe5fea7a6a286fa307d260ed890 SHA-256: c3d04acd22f7593c3683c4fb3d0ff108071503912e7eadd8207726d83248321f
156 Risk Score

Malware Insights

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

The PDF document contains numerous links, many of which point to compromised WordPress sites acting as hosting for further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for exploitation or phishing. The presence of multiple external URIs and link farms suggests an attempt to distribute malicious payloads or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160774dbe33aeb---76232702102.pdf In PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/16248650886.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///nuritenadesopogud.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/fq8dijlntb6ko5f36gsdrqmdc3/35557515010.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/zagojosil.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/b48ae7d300ebe6394259ab9a3ad47fde/loketetuno.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/6d7ae58aefb573182dd4ebd7248c2f26/17016720420.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/vusajirebigavi.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/fakevuxidorunazafazedazi.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c07454e5284---87797798492.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8315c25dca---vorinoxudexupisutemu.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/6824d4271824f8e700e007c32047b870/51655033189.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/0c4270c960306ab4c00dc7f83c3f8ee4/sasedeweseturobanigenotuv.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/577707377.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/40990800571.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/peginebonegumob.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/6b4fe388af7eb7085efb77f62884b88d/96111248350.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/nunimow.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/senaxabaviforuruwipoveto.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/98320048361.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160e8cce06c0bf---nevarumejul.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081921ddd7b2---87459501543.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/50p4gr0bkijbsert69ot2am0ms/kafegak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=rathnamali+gatha+yanthrayaPDF 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_off0000d69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69A 17580 bytes
SHA-256: bdbbc47be9b74174587c32fa6484c98deee98bc50e920394e2af1aecc079d680
font_01_sfnt_off0001053c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053C 10292 bytes
SHA-256: 066cb3fd124f09aa2dabcb140784c963d7582d25db74889e6c4ed215d8afa035
font_02_sfnt_off00011c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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