Malicious PDF — malware analysis report

Static analysis result for SHA-256 0799fae9ec8ef923…

MALICIOUS

PDF

83.4 KB Created: 2021-06-26 04:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 68cd93b62f956a706ee2db5c8241f33d SHA-1: 050edbf6d1dfee169af20bad2da884428809102d SHA-256: 0799fae9ec8ef923ae2726b8bbf311ebec2909476bd8138b4ac7b11c23b7d861
156 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a malicious link farm, as indicated by multiple heuristics flagging it as a link farm on disposable hosting and pointing to compromised CMS uploads. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs likely serve as lures for phishing attacks or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://laborke.ru/uplcv?utm_term=8th+element+chemistry PDF link annotation
    • https://pasarantogeldua.com/contents//files/tofagunimuxulag.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///xadosowuxenumijepavad.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737144c17e0---21284440103.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/ihhqp064gu90tbucr8eua5euus/fejijuna.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a087b05a02---38263210600.pdfIn PDF document text
    • http://rurisnet.org/images/file/71739246028.pdfIn PDF document text
    • http://zuche0551.com/upload/file/totililalovabuvegetetases.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/35898474731.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16088bc3212339---21276645953.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/5t17ppkcmc9q9hsolsefmll5qk/demizorenadaw.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/30493263319.pdfIn PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/bagozujexeri.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9050d79fe---zirekuvuposadizo.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/eaaa69bf140803fdfb7292873704f879/94894138885.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/ac5330850b0766a9a49a4062ba5ce4c4/sesivaler.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/d8fb5606ac876d1b685fe691125db0f2/76931697346.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/2707d7b6fd027eb14fe3762ad026520a/xanazo.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/sgq96vhk5l5h17opjsm8m6oib6/rerivokusamudefizopitore.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/kfu5t4kp6dluf6899j29fvfc6c/96800765281.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160947a396b849---59046797515.pdfIn PDF document text
    • http://minhanh.com/files/23156638589.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE701 16216 bytes
SHA-256: 6e7b5fb14c99a0fd3bbd0607a5859447ac7ee8c7d14ce61ffcd5d1054fa23fe4
font_01_sfnt_off000110f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F9 10440 bytes
SHA-256: 15da1952010d5c3a1ad1edb28e3eeff0bb72fc475850abd331e1a5089c121346
font_02_sfnt_off0001286c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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