Malicious PDF — malware analysis report

Static analysis result for SHA-256 72732b1e6b9bbc34…

MALICIOUS

PDF

87.8 KB Created: 2021-07-13 08:21:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 37056849f45fad28210e45401fcab7d7 SHA-1: a25d35696ce35b03e1ac00857573171e51719a3b SHA-256: 72732b1e6b9bbc343d4b4b05cc0eae25edbc14cd4d5c729309e7222e97eb7666
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. It contains numerous links to compromised WordPress sites, suggesting a link farm designed to distribute or host malicious content. The presence of these links and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/325d01df10e6ee80cbdd7b031b86b3ce/tusigikukadezi.pdf In PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079057c27eb6---koveg.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a35c1daa4c---gagigosar.pdfIn PDF document text
    • http://one9five.com/userfiles/files/bajixegekesikomip.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd415af3a6---34992104240.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c10078cd59---jezetakubivajugafanunifu.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/62a4f3d301ecf67b5ace96e11bdb11ce/zavesudivezeniwibavosa.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c15d8783d03---xakalix.pdfIn PDF document text
    • http://shimoltd.ru/images/file/laguvedepixizedonelovi.pdfIn PDF document text
    • https://mollis.rs//files/fugegobe.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/67811155835.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/23497271629.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/ec909c33d3f7c23fae6295cc1b0e4ce1/10809248563.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/wuwosijediketojov.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c4a790e89---sowigizudiwegoxamedovuba.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bf84815537b---kikuzenopubosedubufas.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/iopi8r06ju4dtbflp4sdu9n0ok/94341066438.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c1fac46c57d---13749783521.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/080824474386.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a2ec7e3d4---kopapatiz.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/pubewidusolupol.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e336a535649---mafuwulawovezeluxiz.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/24373985369.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/25463896689.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/82989577680.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/dnnntt37m8j97kbs22fe0tftr4/lalinejuziweji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+add+text+box+in+imovie+on+ipadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B7 1692 bytes
SHA-256: 6df00093d1a1fd8b8f95901b42ba2863538c90606311dd4adf1993a433792d13
font_02_sfnt_off00010dc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC0 10624 bytes
SHA-256: a4d28dc44229795c4ef7845ea2bc481b1c1cd823fd30cf4fc6f0bb9ccf944a4f
font_03_sfnt_off000125d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D0 16684 bytes
SHA-256: 3ea9c8e96f39e21fe14d1a2d70a77b9cbef77c3d9cb273127909cbfcf88785ca