Malicious PDF — malware analysis report

Static analysis result for SHA-256 83d2b3e85f81bf47…

MALICIOUS

PDF

84.9 KB Created: 2021-08-07 20:31:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 71c207e1b087745ad513d484f60e45e6 SHA-1: bc3c2ee67fcd254704c9e7d796f5b5eeba54f31a SHA-256: 83d2b3e85f81bf4768b050bb524895f840e4695ae0b8f064360c961548bc5a4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous external links, many of which point to compromised websites or disposable hosting, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://smidgel.ru/uplcv?utm_term=application+of+classical+conditioning+in+organizations+pdf PDF link annotation
    • https://cepatdaftargroup2.com/contents//files/62257896964.pdfIn PDF document text
    • http://demirtepe.org/userfiles/file/vuxosepuzabolimu.pdfIn PDF document text
    • http://vhs1962.com/clients/b/b9/b967f936f519796c2a696a6ed1da67f9/File/64311511494.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c634ab8201---58488473934.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/31592264177.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/f8cf3dcd7e73f76e756a6ff0cfa57de3/lofovopo.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/vedez.pdfIn PDF document text
    • http://centrons.com/uploaded/file/63832917760e82b871b8f3.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/29d4e75948e3c89c4ba0726e6b317b1d/zikodurasixokikaf.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/mawibejirifukoni.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/17ea027b69b7fc12f3674924ade06ffa/titevetaninilotit.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/42400183695.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf9cb8f2074---berumu.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/a2cce8d2bd8b079641475e252a1d763a/pisaluxexomomani.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/78256989950.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/25276100175.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/fiwutevivisi.pdfIn PDF document text
    • http://clasesholandes.com/userfiles/file/64888313301.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/81173396179.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/25069582673.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc540fa5978---wagipuxefetevubowaveva.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085c26966863---kedimalofidobijoduxelot.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/k5hj3q5n8pdu58qbqlq93o09dm/18663557734.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa15f19a050---63331988787.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_off0000e761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE761 10704 bytes
SHA-256: b343cdf8a13c19ea9bb4be63b7c1bfc6988a1fd3f5859a7dedfdee42a6ceb316
font_01_sfnt_off0000fff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF0 17600 bytes
SHA-256: 2c3590f8c0f8f2cb48b283d43dd1c16561ade7acbb96ffacc3c1e96b93acd5da
font_02_sfnt_off00012db9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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