Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fdb50ce4fe42b80…

MALICIOUS

PDF

296.6 KB Created: 2021-07-06 19:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 829286a4cfc286c486d2a29c2fd7e579 SHA-1: 982fe19f1d3749d32537bad1db9d722713e54a13 SHA-256: 3fdb50ce4fe42b803b4ea2753dd021725543118a1044f2bafbe2cfb974729f22
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The presence of multiple links pointing to compromised CMS uploads and redirectors suggests an attempt to lure users into downloading further malicious content, possibly disguised as academic material. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160782b950b639---92313818499.pdf In PDF document text
    • https://ferado.vn/userfiles/file/lenabuwujizaginafu.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/78858974701.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/zalasifofabizar.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16085f0d8739a6---jerudurilijif.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/narubaxokexatogow.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/babr6cp9lp9f91njhh7lehh1i1/10191973168.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/nbqmfc4886pm4d0sqr5gjrbff0/wuxod.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/golejokeduwisoxulizuze.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/3entrsmogi1vf0rqt45a19vi2n/najuti.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/38179513890.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16086d54f3689e---jepupirokajuv.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b2fcb081c---biverawuberapakosaja.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/63905792197.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/poleginad.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/998821509.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811937383cf---70044276529.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6d32c23e3---bizewinijofusovugojexorex.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3fffe1151---19189485266.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/8l8v23rr2088fd7rc4m5bfuno5/patebezarojuxujavawusigok.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccd85f132a---kelatefe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=linear+algebra+theory+and+applications+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_off00042aac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x42AAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000442be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x442BE 20304 bytes
SHA-256: 15407b64944429f1407aef34b4f6fca24872c1c54614abd96379a5329d4d1d94
font_02_sfnt_off000478ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x478BA 11112 bytes
SHA-256: 7f964cf0dfd9b61c11a1cd3ffa5f8e0851924272ec6a6f95ee788994d23e3dac

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