Malicious PDF — malware analysis report

Static analysis result for SHA-256 38ab1c2716789cb7…

MALICIOUS

PDF

105.1 KB Created: 2021-08-14 17:30:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 91c2de63985dacde7f8c855ce06adac2 SHA-1: f3aa1d8b5cef6fbc573803b8b47bc6c78d8deee7 SHA-256: 38ab1c2716789cb7675128b10ce0349145667a1adc72be2cb6e1428f6ad58c93
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to external websites. Several of these links point to compromised CMS upload directories, suggesting a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.vnos.vn/app/webroot/uploads/files/56672069611.pdf In PDF document text
    • http://robwalker.net/fckupload/file/kowomuwifolamaforavaf.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/xefiguz.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0387e9ca9---kofuxujiwukugagupise.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/lekatikimixizatujafes.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/fafejamuwekupigalev.pdfIn PDF document text
    • http://cy2hand.com/userfiles/19707892769.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de7f6e6aed---nabeboz.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/getije.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/vaxikituzazanowasudimox.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/menuraribed.pdfIn PDF document text
    • http://camonetinternational.com/files/file/63774526026.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/4b819c066971bbbe8c321385f5dc9c12/povifivid.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079e97c8a948---nazaduwujaboromev.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/58584845729.pdfIn PDF document text
    • https://warungmimpishio.com/contents//files/81393262681.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c82a7f39a6---puzugamevenojogaxesodun.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/dd19d5bba276cfec26782eeb3c86c353/35562780400.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/be94f7b0095888c88610a467049f93de/62637161155.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/24419740848.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a837a224e---vifotojugoxuwe.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779d0ea9309---matalekajosumaten.pdfIn PDF document text
    • http://e-hematologica.com/users//file/ruvawagenarixidebipexig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=student+exploration+distance-time+graphs+gizmo+answers+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_off00012fe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000147f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147F7 11524 bytes
SHA-256: 9e95d6a5e8e8fa38bafce1420aa4298d630f7abe8b41efc0b00fa909395d5884
font_02_sfnt_off00016309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16309 18180 bytes
SHA-256: 5080f1459d6fb5d2050ee358ab8f51b7673b413afc2cf4996b34fcba143eb335

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