Malicious PDF — malware analysis report

Static analysis result for SHA-256 89ac3f818ec27582…

MALICIOUS

PDF

75.8 KB Created: 2021-06-29 18:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d29bd0b6a93e8f4434cc1cfc583f25f8 SHA-1: 267aaed85194050b820554ffd41c761b7c144eae SHA-256: 89ac3f818ec27582ddc0227661fe20ebe198a3599016263a294e2a8e3c22cbad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristics indicate the PDF functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS upload directories. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://laborke.ru/uplcv?utm_term=bering+strait+meaning PDF link annotation
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2674888582---fogotaguwowa.pdfIn PDF document text
    • http://cogersquest.com/clients/f/f6/f6194b381802d71b6842d6160e8859b1/File/sukezovalonobapokopuvuxe.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/e99bef79b1c8d5cfc1e6e7e60c6eabdf/13595151172.pdfIn PDF document text
    • http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/gasaguzekogaletubigid.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/h6ckgut3d4d3dhak1vbkkakg00/69265595767.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11da806197---jugekuwetu.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/buremagibibe.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/kijasokezibulupezosagexod.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a873eb1306e---xexoxaparefajiwotewuku.pdfIn PDF document text
    • http://bigsvatcharasith.com/userfiles/file/65112739107.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/misinaxajini.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/2105140545005694155o2vr9.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f3007526f---68177794363.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b253dec420---79459812823.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4da93c72b9---5092290015.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/9188721b23557772a904dcea96250574/mesafotiwus.pdfIn PDF document text
    • http://berbun.com/user_img/file/81266097744.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16213652564884.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/28314043695.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/vajab.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/bc94a629e20137b1094419a3fa657d4e/32760105858.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c150094ac8---10850176115.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6cd7b9df3f---lekonadod.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/49360681644.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/81231061765.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_off0000c452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC452 17716 bytes
SHA-256: 6648de71b88ea414ca777d820e68864ac233ef606c6996a94be7a6d2d6e8f7fb
font_01_sfnt_off0000f2d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D2 10340 bytes
SHA-256: bde41676300b8d7ce39601a0c5d042ba2d7d3c6dbcb7fa473b63f3fb257155d6
font_02_sfnt_off00010a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1