Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0e358aab019d702…

MALICIOUS

PDF

96.2 KB Created: 2021-08-13 20:42:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 14418e4159cfcd56fc3f59d8ec30279e SHA-1: 16125986e7170131ce5347f3a3679eab3db0b9fb SHA-256: f0e358aab019d702f12b81798abb4703dd8d3f87a02bc9c97f7f0c2f350bce4b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery via these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 https://equalland.com/uploads/File/pusaxoxukibum.pdf In PDF document text
    • https://topupdana.com/contents//files/49131405670.pdfIn PDF document text
    • https://atphp.ch/userfiles/file/32434838972.pdfIn PDF document text
    • http://websurin.net/UserFiles/File/29637509277.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/feliratodezijagego.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/2c0594339f3aaacae72076583d242098/lemikurugulaxejevi.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082453e875f6---33469897026.pdfIn PDF document text
    • https://duvarkagidierzincan.com/userfiles/file/7556070427.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/kotujixit.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/fifex.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/bowenakegagunal.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/sujabis.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/tijofufi.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/64926382101.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/verafonarotebupoga.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/fde43550db465fd45dfbf24228a81b5c/83907240726.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/batatimesadikisoroxe.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608934e316b4e---pomelajo.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c397cbd54---xugemizaxet.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/faravaxexowumixekezivafo.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/2a61793095df82298a8c390b8a07ee2b/nalomibegenufam.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607e43d30bb57---59903127376.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/34932774387.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfcf294b826---42562058005.pdfIn PDF document text
    • https://t2sc.me/userfiles/93413754663.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=ejemplos+de+los+elementos+de+la+comunicacion+referentePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF832 16384 bytes
SHA-256: f6e3431b3d13d45829f420cfd7aa892ac76e07a456b12580803bc6bfc48f2428
font_01_sfnt_off00010e81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12698 10992 bytes
SHA-256: 8774aa48b6a6fd26059a2f96926590f863a43091e50214100fd8684ea3be2380
font_03_sfnt_off00014009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14009 18588 bytes
SHA-256: 7a701806e07d849f5120edabbe2062237d54c08b9a5f41e63af27c432eb574db

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