Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b6ff0ed6c2c39ec…

MALICIOUS

PDF

86.7 KB Created: 2021-08-11 06:38:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5ce802b06c486bbfb20c483387919d40 SHA-1: 487f7440f1a32da185bde3128961f7ac8c1a817a SHA-256: 7b6ff0ed6c2c39ec71124068bc3e1435c0361a242dff88e1f9dd4643a5e478bd
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external URIs, many pointing to compromised CMS upload directories. The ML classifier and ClamAV heuristic strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure and numerous links suggest it's designed to lure users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://contabil-fiscal.ro/mm/file/65376514060.pdf In PDF document text
    • http://acril.ru/ufiles/files/tupuwigumavonemesetozuma.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd2a71657f---reradumaduj.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/d502ac5f7b65356e2b3aa6bb8fd9a762/12218487332.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd5e28d8999---41045866507.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/sikupanulowitenuw.pdfIn PDF document text
    • http://bscartridge.com/pic/99400405036.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/voxemujepipafukeb.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bccb85e0873---mumimonarowodavabimodo.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d706696231---44173910238.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/5181c1904866d7014b5ac9298afd84d9/36324286253.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/kenabimusiserufagaj.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/39805192723.pdfIn PDF document text
    • http://permianhighschool1970.com/clients/e/ef/efee9fcbc667252fc4b649c8163d3733/File/93633969263.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6b2379488---80769004955.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/958705265.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/19366393582.pdfIn PDF document text
    • http://epmachine.ru/d/files/79496651332.pdfIn PDF document text
    • http://hasyo.net/files/file/37554132142.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/wajilojedijuzajonalo.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/64535695700.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/1047196534.pdfIn PDF document text
    • https://cesiedizioni.com/userfiles/file/jipebobogiwimixe.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/72h96u7bf3n1hs21n7k58sio95/xilubuvuzupa.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/danoritugaver.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746e8214758---kijalifodewumobepejivif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+get+free+apex+coins+in+apex+legendsPDF 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_off0000eed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED4 16816 bytes
SHA-256: 0853e198a9ddc1a0729bdcef0422319ccac0f18eba809f5c6a2fd660126a6e13
font_01_sfnt_off00011a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A94 10972 bytes
SHA-256: bb5f7079bcef164f9a8d4680417380be2f28e55a537cc9483c728045dd68fde6
font_02_sfnt_off00013409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13409 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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