Malicious PDF — malware analysis report

Static analysis result for SHA-256 128e4f0e50f73375…

MALICIOUS

PDF

79.9 KB Created: 2021-09-02 16:00:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3826ff0334efe2de1a6e69f042be95d6 SHA-1: 969f159509a7fec947a1162d342760ae37cc01c2 SHA-256: 128e4f0e50f73375480be53386eedefdf75be9020e4181e444e57e53a31c0a6c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://pixomot.ru/uplcv?utm_term=kenmore+elite+dryer+troubleshooting+manual PDF link annotation
    • http://andlupa.com/userfiles/file/17044469763.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/dbdeec8815775b3ae79c4855661e2fb9/27279731439.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160be8af730553---75012832396.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609199670d223---4058365641.pdfIn PDF document text
    • https://magnanelli.com/userfiles/file/28663670922.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/suzizunilajorelexuvoruwe.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f4f929f8a---90535073189.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/61640961122.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad714916c39---kemesovoserekilekemo.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/86153747111.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/pisufumapumeroxuzuzi.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/29416306236.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613058dfd1703---94602073420.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982bf91c2bd---vaped.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/94204496281.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/30315116843.pdfIn PDF document text
    • http://china-spec.ru/userfiles/file/58992230750.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/widigovarogikarofuvi.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/rasefe.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/62994786649.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160df7adb494d3---64904056452.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/gajimoguwuw.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/soromalagip.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xojexolezadak.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_off0000d1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A5 18120 bytes
SHA-256: 3817ad95c2849e78a1bcb40500ae043bc4fb0a911b14e8d1a874733baea9cc4e
font_01_sfnt_off0001009d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B4 11040 bytes
SHA-256: 46d35e7da9bcd68489af3d4b284f803e23b9ae54c708826f66cd3ecdd7996cd2

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