Malicious PDF — malware analysis report

Static analysis result for SHA-256 35ac54e0ff638fd2…

MALICIOUS

PDF

81.3 KB Created: 2021-09-05 02:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8ebbdbceb0b3f321d38d81932fdacbb6 SHA-1: 8c48f5fe08acae16523a90a60b4a20313a487887 SHA-256: 35ac54e0ff638fd2d965271084e0291c0f2fd19d4d512da0f924197ccc07a2ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://catamma.ru/uplcv?utm_term=subordonn%C3%A9e+circonstancielle+de+temps+exercices+pdf PDF link annotation
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9638a7001---87833131219.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/16202272068.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/kupemawomojokam.pdfIn PDF document text
    • https://dineflon.com//files/roguzakobizuno.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb28db64981---bezetofurejoguzolimisige.pdfIn PDF document text
    • http://geonatlife.es//ckfinder/userfiles/files/jamizedifapo.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/a5f3512cb55308186d32adb6bb138d08/vodagerosemenamilezozaro.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/2e15e45b6dc179cbff778df574297035/xajaxito.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/75987826884.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610954b0d8839---38983230775.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/31185376028.pdfIn PDF document text
    • https://lusagroup.mobi/images/website/user/files/riwugikosetisoxozejupisif.pdfIn PDF document text
    • http://bluedevils59.com/clients/862365/File/zakekuluxomavapaputugi.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/nirosozuzenete.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609838be25d75---68478663277.pdfIn PDF document text
    • https://scalper.ir/data/files/file/masafetokujanonu.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f043b23bb---dujegibagepinuzowovusid.pdfIn PDF document text
    • https://cahayaapi1.com/contents//files/levalaza.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/4jei4a7fu75hgvj3o4g79uuu7j/45739574453.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/godawiwok.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/92312809357.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075d32dbf41b---ritofakul.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/rafosarugupeti.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_off0000d1f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F1 19568 bytes
SHA-256: 0776028195cb16b6f06c37d0f5d8335b023e690bebd254afd0fa7f4ed2206abb
font_01_sfnt_off000102b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B0 11352 bytes
SHA-256: 8f843d9dd7d52be546bec2a1f3c4341bd8dbb36c3e7ee03b1e6fbee9d38d1a97
font_02_sfnt_off00011ce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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