Malicious PDF — malware analysis report

Static analysis result for SHA-256 98981808553d0b8a…

MALICIOUS

PDF

86.6 KB Created: 2021-07-16 13:33:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1afe836438898dc3de56893727c0380e SHA-1: d804b5e541c6686e519c0ab9c700a7c3cf933944 SHA-256: 98981808553d0b8ae82bd9b0d3c0bc08dca5e52fedcc889a4bca9d9952448b48
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://oniceh.ru/uplcv?utm_term=word+for+small+group PDF link annotation
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a846dc9bd2f---xejejakobaputup.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/6bc68bc02f8eeab4680ed6895daa42ab/revolimozavevodi.pdfIn PDF document text
    • http://klpa.net/userData/board/file/tusikejutidafi.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/97bd8ec37e10e51889bb017842ee1a45/lutosaze.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e570ade8b5e---latulefasolomujibil.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/zerebawodovixa.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/26007281044.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e34929247---japozefetoforabarapavuv.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/94697581549.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/b664eedf9bc3b9b0526786678045bac0/54028336946.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d72ec1913b9---74146286332.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/gotowavavofavaxoxatudiw.pdfIn PDF document text
    • https://dock-levellers.com/upload/files/39016318077.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8785100cd---87407831893.pdfIn PDF document text
    • http://fitviewer.biz/files/file/sobekaveg.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/19627606591.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c65596785d7---werepesob.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/gilivefezanasunukibopezof.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/13374615fd94c245d80922ae3b8ed962/98726804896.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160700a2a4c6a8---2697815536.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/fesumamirewodowidoko.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/25149751839.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/5ddbac61b78ec33e4d7afe53ed946bbd/tixefigaxetofilulufeweziz.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_off0000ef67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF67 17956 bytes
SHA-256: 2d3e7df7e4e66a51da7efbea63fad3cdb1aa7a5a40b5ca2c241238d1bf2da95c
font_01_sfnt_off00011d55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D55 10508 bytes
SHA-256: 93ea5cf59cea895241d13d7e1d8c1a71fdaf602135efe6b7d6374b7e0d5a04a7
font_02_sfnt_off00013512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13512 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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