Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0b0f68a96880d20…

MALICIOUS

PDF

84.5 KB Created: 2021-09-16 14:21:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ca48dc6420b0eee4c452ccaafbce0c45 SHA-1: 8bff33ca6121d1126800e1361234f7dca23f7523 SHA-256: e0b0f68a96880d20999b0156af089a18c88ed0d8c1e2f6532d434fefce9c48c0
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest a phishing or malware distribution intent. The document body is heavily obfuscated and appears to be metadata from the wkhtmltopdf tool, providing no direct user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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://pistant.ru/uplcv?utm_term=ultimate+phrasal+verb+book+pdf PDF link annotation
    • http://agama-rc.com/upload/files/gunojuzawipotuzowotam.pdfIn PDF document text
    • http://atrsara.ir/resource/files/46910784418.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/668a77f5d060289bbe774a2ff6b14288/deroligage.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140bd6dcaa73---28366833456.pdfIn PDF document text
    • http://kbchina.de/upload/zobogotufelusapij.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/32730687790.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/lufipujigudobibarewefat.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/40b10e85da1cfd90c5e2f81c6e9b6cef/zelegujimukepapeminexu.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles/file/46156431484.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/punimikawuz.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/36572215976.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/84828646571.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/givalewuzopopomojojeme.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/lukupegazafipobo.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/budiri.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/xugunifonepurarebelezegiw.pdfIn PDF document text
    • http://guowangcable.com/d/files/19331689792.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e5328ada7---21473276207.pdfIn PDF document text
    • http://robedecreateur.com/img/files/64208006802.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/filizowis.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b8dcaf712---kaniveporanemabix.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/xijina.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/60948026924.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/tujuwalefosobosugiderowu.pdfIn PDF document text
    • http://apple888.vn/luutru/files/pokojorugazemibu.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/vazawidasasizininev.pdfIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC59A 10964 bytes
SHA-256: 1f674324368c8eec04a333a40fc793eabb2ead2c413fa6f7b243a219bb733e1d
font_01_sfnt_off0000ded0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED0 22376 bytes
SHA-256: 857ae29ee3416a7c1fceca4ab5a5e64c42e6caf06ee4a2d9c2a26e9244854854
font_02_sfnt_off000115cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012ddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDD 16180 bytes
SHA-256: c0217721a1102ad1f8a8ff5461faadb02f26a3634bfe128d67f68b25b112ee8f

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