Malicious PDF — malware analysis report

Static analysis result for SHA-256 5709e2a9ca9b64ad…

MALICIOUS

PDF

146.4 KB Created: 2021-07-18 11:07:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 51e00f50ecf6014988a76d83d6f2531d SHA-1: d783236468d37e9707b8dbcfdbda5c0ee858b87c SHA-256: 5709e2a9ca9b64ad18e0d212b9b45972a1b83d3188b228798b5eed77be02bd18
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs, many of which point to potentially compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to malicious content. No scripts were extracted, but the structure suggests a link farm designed to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9761

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 http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdc0b264ec---56917030777.pdf In PDF document text
    • http://edumedcare.pl/upload/files/22983905358.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/4229157613.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c146babe543---72351745562.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae88d8474e7---similotifeju.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/2789422142.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9be8aa84f---vavidonabapavidedevuroxi.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/oesn48e5f4dq1ic4minqli8qd3/saweviniz.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/vopugotujisuzarejog.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/95982445194.pdfIn PDF document text
    • http://imi.vc/upload/files/xoserumowopopafofezixemof.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/vamemoxawubelerekusage.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/9ofjis9hls923mplf6erun45fe/81447920030.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd0ee0b06d---xebabasebepilojabu.pdfIn PDF document text
    • https://callalilyvn.com/upload/files/33910782547.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/1b45a4i1daahvkii54ug35bv0n/58326201137.pdfIn PDF document text
    • https://kawanmto.info/contents//files/vugadiwa.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbac52e3e7---vumamalagogewabagolawal.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ee465482900---vufolotubilujadegu.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/14159771629.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/13b031fd4e2cbe4ee9213dbc7ac59c61/sokowewusigavamabofijuv.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/latv0up9j29jc01cqtln8u9j60/mutakun.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/63922057110.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/xovewafokize.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7f2cc0e6e---rutukozegibojogenemeke.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa82a01cc2---86590829609.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=define+the+divine+right+theoryPDF 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_off0001d7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D7F9 10436 bytes
SHA-256: 5b44e7768881f8bf051aba9f95aee708debb5d397adf7e9c67b53a02ac2e94aa
font_01_sfnt_off0001ef5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EF5E 21132 bytes
SHA-256: e83ca45c0ae4cbf43e3c32823d25d83aac81aef6177d6d9addf128ba7c349fbd
font_02_sfnt_off000223bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x223BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1