Malicious PDF — malware analysis report

Static analysis result for SHA-256 c741669d3f403e91…

MALICIOUS

PDF

81.7 KB Created: 2021-09-02 22:44:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 502bf694447fa9058820f1f94a4663df SHA-1: d237d5ebc4bb4d4d7efad1a39860a6476b782b02 SHA-256: c741669d3f403e91bd0b939884a7681d0b6a0d2063eaead74e754e4b38afafdf
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous URLs, including those pointing to potentially malicious content, suggests an attempt to distribute phishing content or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://queure.ru/uplcv?utm_term=perimeter+of+triangles+worksheets PDF link annotation
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160861aa79558e---bavonufojuzoselinoj.pdfIn PDF document text
    • https://familienarbeit3plus.ch/userfiles/files/wakivupizot.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/lanuxure.pdfIn PDF document text
    • http://www.toptehnik.si/images/95098106871.pdfIn PDF document text
    • http://dermaktif.com/imgup/file/22783901671.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16093d46d88efe---50192161395.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16071f351cd408---29013239054.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/lapudenesuzolopiterom.pdfIn PDF document text
    • https://samavetah.com/ckfinder/userfiles/files/kugukexoviluwitizaxegip.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/qa1kovcji1fm8f25ijdq9ssi7o/81550620177.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909a3cb5b07---70347267278.pdfIn PDF document text
    • http://nensi.si/upload/file/57918341741.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/femevorarobevejawok.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/jufemekunozelib.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/41046889749.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e30f665809---52936704870.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720cc31b770---30696539835.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/44417940548.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021071009333273499.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/55716aa58b52c2301aad7032c330e817.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7a0f89e23614336c8ad82e1ee97da14e/dugujexolunoribo.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8aed65a43a---gomezefumazojo.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/7d77010d5da9edb66972a2afc671c419/dowevug.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/zogixiwulolopub.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612941982334c---borasuvesugireju.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_off0000d9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BD 10840 bytes
SHA-256: 45dbe41324cb1d36d2f55703e4edddcc5548f669e335b4e9fe317e4a372237b6
font_02_sfnt_off00010aa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA5 17928 bytes
SHA-256: d6921964cb3bb2efd83cc748b88359b13446d3c0e9a11e04986d9990c5ab385e

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