Malicious PDF — malware analysis report

Static analysis result for SHA-256 91b1664b744a1214…

MALICIOUS

PDF

89.5 KB Created: 2021-09-08 04:37:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5078e22c412018934c122b136ac3f5e2 SHA-1: 499cdcc41be7859b6df3576d6bfd61ff8cbb8b71 SHA-256: 91b1664b744a121414fe11da2b47b6a4c77f5205463f6428b9002ca1a1c1b5ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting, likely intended to lure users to phishing sites or download further malware. The presence of multiple distinct hosts and the use of UTM parameters suggest an effort to obscure the ultimate destination and track user clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://garglob.ru/uplcv?utm_term=harvard+business+review+november+2019+pdf PDF link annotation
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a94f094f041---xinubomujexi.pdfIn PDF document text
    • http://yuha.be/_files/file/pusapepevijuzis.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/2f33abbaf51af74effa155ec24d43c75/51444150364.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1de9d9d8b4---buzesububasuluzupi.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/2nbsh61j8g9e43kabd0q515pl1/94558566136.pdfIn PDF document text
    • http://ballstonfamilymedicine.com/clients/861402/File/93636977079.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/29080609447.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp//files/vafenawijew.pdfIn PDF document text
    • http://m4krichmond.org/clients/3/3b/3bf4c986be49c21931b3574e72fd8103/File/80457452530.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/felexapovedodewobusepun.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/kopit.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161125e9d91d55---dinumizikomenuzixa.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861fa9ae109---26244520836.pdfIn PDF document text
    • https://gilbertems.com/videos/file/82857023211.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/vizebavukewew.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/sebuximudijogaso.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/1qe1uv2fjrvq28kp9m5j6cgjr3/jufalatowofifasigusatiw.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/f3cc0d60e56d67eaa465fcbb2751939f/70334114340.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/feziraf.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b26b739a56a---nurivofusinikalexewofu.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/10934420592.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/kenumogufabew.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070cab82fd76---rodevu.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_off0000f5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B7 11360 bytes
SHA-256: bd548c7d76a0a8478d136528dba0910d4a2b7d42fb6dbf2d016a1c48a28bbb19
font_01_sfnt_off00011047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11047 18816 bytes
SHA-256: bceefc6d3e7d71950b22f66c769be5d7a52cccdef2914b4533000ef5748159f8
font_02_sfnt_off0001407c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1407C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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