Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6a6fd9b6c9b87d7…

MALICIOUS

PDF

89.9 KB Created: 2021-06-28 01:22:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 928cdbcc5932fcacd7e4d9f25ec1812d SHA-1: 492dca2bc992d2bb348c7a432947a459acd982b6 SHA-256: b6a6fd9b6c9b87d7e667b6c78548edbe4b71aa512a96b29bcaad51d4ae24b1f9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malware or phish users. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://paillasse.hu/userfiles/file/gukura.pdf In PDF document text
    • http://albarossa.jp/js/upload/files/76375314497.pdfIn PDF document text
    • http://tipiland.net/upload/file/82988554258.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/f484c8f0f37abc3e5a734d673bd575fb/lenaga.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc0cb8def8---vuselaliruv.pdfIn PDF document text
    • http://short-story.ru/upload/file/89982999517.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f85c4324a---68469023290.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/244455334.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b622a90a6c1---37773867573.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/1186594532.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/87410912700.pdfIn PDF document text
    • http://crmrealty360degree.in/ci/userfiles/files/xogegumitamakulefel.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/8vfd7hgojufcfv2mmocml027pe/61171563236.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160af9168ad5d2---46120916558.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/6967535852.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/5673b66964890569c174d2d8085ae2e5/44715001057.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/4402832733.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/dt8rp93kd4dmakv65ifahltau5/delesukumew.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607496fb25e97---66256536514.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886b774b14e---36706810032.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/98375315576.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aed32861449---kupexez.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/zewemebeli.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe7e8a069c---17072544137.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/sovuwadigaruvu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=plant+cell+and+animal+cell+figurePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001160c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160C 16944 bytes
SHA-256: 7428ce8ec7897acfdaffe3eb948999d7c985a461ec7574250326e3677c17dbad
font_02_sfnt_off00014218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14218 10632 bytes
SHA-256: 31eb6fed795f8f581f0a60624d5dcb40db484211e9d1cc481558013a360f1fe0