Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf7f1e1429d77141…

MALICIOUS

PDF

76.8 KB Created: 2021-09-06 04:43:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fca0465cc5010cff9c08ee2eb8e7eeee SHA-1: 823f28fba6c709f375352bd40e6f3317d707df5c SHA-256: cf7f1e1429d77141a68d7ae5305f097cdea6d2747d7563ef436997dfbbe5427a
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://archism.ru/uplcv?utm_term=fundamental+electrical+and+electronic+engineering+pdf PDF link annotation
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46759286320.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cc6ca00f587---birutasuzejelewib.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16121aef2288c6---pizejikafo.pdfIn PDF document text
    • http://baominhlabors.com/upload/files/bugowefagoruvupe.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebeb9aeee8---86849761099.pdfIn PDF document text
    • http://www.og2c.com/images/file/judusepumafetabovowin.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/35799373487.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/faginalevi.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a857bb84e8a---26570431724.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/a2h50rff782ppmi4i8j39c6935/wotelirubuzonofov.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfe1f5d483---welowukotatuduzonitixelop.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/sugixiju.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/1d04c042122285e6d75812c50b527742/bowimesime.pdfIn PDF document text
    • http://monktonlionsclubkidscamp.com/clients/9/99/99b8b5517e5fb663501b7ee5137ebf55/File/bajebuvekegerakumotu.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f6eacd156---79334753238.pdfIn PDF document text
    • http://lhs75.com/clients/46937/File/batujifurigazowa.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086ae167acb9---bopiwajikidimosaz.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/vesijetedutavosozeza.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/5mshh9ne4dlhtc4t0qeenqm4kd/falelebodo.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8ac95c5ce---30283270421.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/guvelexenafejab.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160befaa38bd8e---74185640962.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/86091212802.pdfIn PDF document text
    • http://szpk.hu/_user/file/benonakuvasibilibilu.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/wowututozavabag.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/rozisusuwa.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_off0000c741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC741 17328 bytes
SHA-256: 024f3f0186f7e63bc4a45f33e3137164e848343fa90c3924cfca5b9bd31e1ba2
font_01_sfnt_off0000f3b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B8 10872 bytes
SHA-256: 0a70e3264e2925fc917251a5ad9d5ec8888d34e4b6a40dbf1e4a57754332f99e
font_02_sfnt_off00010c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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