Malicious PDF — malware analysis report

Static analysis result for SHA-256 4302d920edffe9ec…

MALICIOUS

PDF

80.0 KB Created: 2021-09-01 21:30:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 83bc07982362cafd3c5f445a3b50488a SHA-1: 06d04cdaf3a0d4d754b64319fcea208d3cc71bc8 SHA-256: 4302d920edffe9ec24e07fa9f728cbfb4a230f34fe4a38aeebc2a545e819c5e5
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 CMS uploads and disposable hosting domains, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://study-abroad-travel.com/ckfinder/userfiles/file/letedajajanutumegoti.pdf In PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073e117ceacd---jojuze.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608937c429d7e---tewemodepumazaw.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/37260714377.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/gn8cinjfokhqn511sknu6q4fbh/71669910779.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/c1go51i86h5qbp0bndf7grsmml/xevurujuzalega.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/fa645ec2e62e0d985cf40a894328b007/10689268951.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9b694a61d---15187155615.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/72975308606.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160f0dd09adb08---bupipiwuvikinojowisipefam.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/79989a00bbab4abb8b4eac85cec20a96/nojoxipok.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/79662203261.pdfIn PDF document text
    • http://giayviettri.com/img-ftec/files/xetivetukupomalatevelaj.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/db1a3565f5240a6036207f652b0f7dfb/2097924202.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/90112230620.pdfIn PDF document text
    • http://poorclarescork.ie/images/31185191018.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160d66ecb1bea2---dodofajo.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/detose.pdfIn PDF document text
    • http://tele-video.ru/upload/files/71807232421.pdfIn PDF document text
    • https://tekmaker.com/upload/files/23955192319.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/56164322341.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089771499668---49609397171.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/96376277543.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/42327343668.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/saziga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=good+witchcraft+books+for+beginnersPDF 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_off0000cf83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF83 18344 bytes
SHA-256: e5c3b8253199e9c68f3f331655be64a2ba31b8146b7b309ce26e95ab2d298bc1
font_01_sfnt_off0000ff98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF98 11064 bytes
SHA-256: 392cf04d56414388e86f271204c679fdcb147191e418da74a94a7a7d96faeb0a
font_02_sfnt_off00011938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11938 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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