Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a908a1af3953649…

MALICIOUS

PDF

82.5 KB Created: 2021-09-19 12:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b1d213937eff54748d0ffe7b07211271 SHA-1: 7150a06836a2a47a71e08a1dd47ee0c242a2b49f SHA-256: 9a908a1af39536491abaececab75d22cd535d3faaa5630e7540e6671e04b8b36
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress sites, a common lure for phishing or malware distribution. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to download a password-protected archive, a technique used to bypass gateway scanning. Embedded JavaScript streams and external URIs suggest an attempt to execute malicious code or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16134d8e452981---nagenolegukupawobi.pdf In PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/wizebonebakobi.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/cf899812c995e086d1beaca32a72b555/67499640787.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/zefuwesowadifapepigugejok.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/juverapitunoluj.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/3a94e0d497d689f6bdfc7643ee859c31/27993616947.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/xamari.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613776574d9f4---28354772823.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/tazipowufiwewigobaz.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16132f9af959f1---50164729613.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/binabeguzidixomomapu.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/10028117780.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/9070278355.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/92887570244.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140a170249ac---bamakamijakenugana.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/14826273736.pdfIn PDF document text
    • http://pileki.com/imgup/file/fijizokus.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/wizazasagutepewuwap.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/54181250318.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/49684847781.pdfIn PDF document text
    • http://trevorhannant.com/8933697419.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/31565285264.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=show+wifi+password+android+no+rootPDF 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_off0000dc85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC85 18572 bytes
SHA-256: 654fd4e4b6936b21e41841d23dcdfd584938890b9de3b7585ba35ed9f381e846
font_01_sfnt_off00010caa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAA 10576 bytes
SHA-256: 40e408d081751bab8c31cc1e6efac89289cb4dc8d7eb6dee083bcda1a0952d0c
font_02_sfnt_off000124d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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