Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac9d5ee80ba0109a…

MALICIOUS

PDF

68.5 KB Created: 2021-09-15 08:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 74a14f9b9a9c4777b2963f75d49043e7 SHA-1: 7f105b2d67d0d4f8b190a95a262852e4efaf450e SHA-256: ac9d5ee80ba0109a21c3b77479b6f9a03f3831f551d494aaffb2e5c84393c13d
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by an ML classifier and exhibits characteristics of a phishing lure, including being image-heavy with a clickable action. It contains a link farm pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The primary URL, https://synerhu.ru/uplcv?utm_term=clear+vision+5+android, suggests a potential attempt to lure users with a fake software update or download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://synerhu.ru/uplcv?utm_term=clear+vision+5+android PDF link annotation
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0768bf4bb---boduzaloxasu.pdfIn PDF document text
    • https://siliconautomation.com/userfiles/file/86311113066.pdfIn PDF document text
    • http://maksimetall.ru/files/43199994766.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/1786592677.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/60b91249b2fa930ac93557de598198dd/67650821995.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/07ceff9f7bf11a0db3b9dc2fcf6455de/vuxebegupinanuvuz.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///sakaxamevukujibe.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161410e2b95d97---27706257369.pdfIn PDF document text
    • http://citty.org/images/uploads/file/19945481553.pdfIn PDF document text
    • https://fishboat.hr/files/gigolow.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/dudenaja.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/25388675716.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/48b7db4df49e2793e2edf84a04dd8b22/gafaxolemotilipefemavetep.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/77781737080.pdfIn PDF document text
    • https://estoniapools.com/contents/files/43379488241.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/nagaladokemagibovifiw.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/dorukebuzukulotamufodux.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614110aa01664---37555519225.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414a1c32c03---2633265804.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/657023513.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/58095164070.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1631383924.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/de64fbf5844abd58a32c38013a238cea/gatezoduwutudejovazi.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/33113260266.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_off0000b2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E2 13888 bytes
SHA-256: 22a63c90948be22a975ab98705a28cd53a10d92073f8da889101f649dd48490c
font_01_sfnt_off0000d4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C8 10376 bytes
SHA-256: 75cf351473696c1c5901676294822731ce7319a8f2ebf62a2dbf464a9ee6c5bb
font_02_sfnt_off0000ec67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1