Malicious PDF — malware analysis report

Static analysis result for SHA-256 fde9aa0fd6782a57…

MALICIOUS

PDF

81.6 KB Created: 2021-09-02 22:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 54e9baa9e4ee6e6eac8b45873d8acecc SHA-1: ad05f573276c05a1f11800ea39fbb14f435eeb2f SHA-256: fde9aa0fd6782a5705204db882d488a00d2ab493e27c85a87c1c48c8e70f5816
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm. Some of these links point to compromised WordPress upload storage, suggesting a tactic to host malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://debden.org/userfiles/file/61972696976.pdf In PDF document text
    • https://rougezenekar.hu/files/file/woxometona.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/38602435988.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/630826e17bd3a01a940ab2cff099aef3/puvudojimivogedatawe.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/03a45945b4bca45f73d409fb9aacc649/mijumapumex.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/9474dd98438cebef2d67a6eeb7484c4d.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/6821234922.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///91797647943.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/nupezemanusuromenatoga.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/6840050769.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/28063387281.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16088e04b007e6---jobavaviwe.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161059df543760---zutewo.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/guneletedavalerabuwesoka.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/62864f67ac2dc1668946a2b626094160/11371534944.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202108170433502039.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/259a4234d894718a2b1f7601fd404dcd/80739274351.pdfIn PDF document text
    • https://ptogel1.com/contents/files/lufesofiwuxilol.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/ca8310522c4ba15507512f358720891a/gaditojuni.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/15novo759mnpu2nfbm9a7j3nqg/60128873902.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/e719d2388a612a84268178eaf9017a0d/kipukakewijox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=manwhore+%2B+1+pl+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_off0000d9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E3 18816 bytes
SHA-256: 000c41fadeaf90bc4107afd4797d568ce5c64606cac90298813f5a81b51c2740
font_02_sfnt_off00012242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12242 10368 bytes
SHA-256: 6305d4a7610bc15a9228bbe5c5c6a7b05822b77d8802f09f4a4bacfbdc32a423

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