Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3f5845cf6518ddb…

MALICIOUS

PDF

79.1 KB Created: 2021-09-06 20:05:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8a1a56de6b5fdc60c5980a9d8767e32f SHA-1: 5e6bb87aa32b5e5bf3faf37454d2ee2ee316dcfe SHA-256: c3f5845cf6518ddba9201e5c5153a9f46b73a32a08e10065d86724ec47bc9890
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to lure users to external content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL analysis are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e198b660360---novurazilagugabo.pdf In PDF document text
    • http://fkm-lux.by/var/upload/file/81394634888.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/betidolulasevanarilibazoz.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160767bb2cb07a---36519175475.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/benogenatafek.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/todisusogixonezasefon.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/38764792959.pdfIn PDF document text
    • http://edgewood1962.com/clients/2/2b/2b25cacec04995aba37d275b9c35b4d1/File/dalevixupavuwosokitameli.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/82296458597.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611344704651d---wibedunafabitaranukatipof.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/e2a8027016317a4c9d568ae7038a4cbb/15225137771.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/d1212afc52152a06039ee2de677c3a27/pukokunefixisubovugasasut.pdfIn PDF document text
    • http://debden.org/userfiles/file/maguwazanevozaxidafu.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d08ccc2425---joxutesakirabipezokumobuj.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/wigajebapakagafi.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/mijigikulodiruma.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/sapeguf.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ff07d067cca0f258b8eb13580a7a0edf/36813097267.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/21539040634.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/veburoxof.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/nejafosi.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/92572988646.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=anatomy+of+heart+pdf+filePDF link annotation
    • https://medlineplus.gov/anatomy.htmlIn 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_off0000d209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD209 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1B 17316 bytes
SHA-256: 1f54d28389301afed2b9252f52c28353300c751148e8a20ab9499112e3258df0
font_02_sfnt_off000116d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D1 10688 bytes
SHA-256: aacb3bfe8509a6f152ca327d83a5382c3f1a2fcb18a1b77fb0c90728e2136f6f

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