Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c3965d8a5220025…

MALICIOUS

PDF

74.6 KB Created: 2021-09-01 19:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e62784b630f23e61aad8ff50259acd00 SHA-1: 84efdb87d31f34c1c1d654dac1057af07c0d6197 SHA-256: 4c3965d8a52200257820a266ba24dd492b9258d0f5fc001aa11113aed11e86f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting. These links likely serve to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://medvor.ru/uplcv?utm_term=a+long+time+ago+meaning PDF link annotation
    • http://envigest.cz/upload/file/10884493503.pdfIn PDF document text
    • https://codecs.ro/images/file/rejap.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/88427847604.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606de66ab6de9---59698458504.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/d8a08271bf01612829a62b9dc934e040/56441929152.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/getotukedasira.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/majagepenulo.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/s395u2vkf974kiii19jv54v4p0/59225648195.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/87097218113.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075903b940e1---53566494153.pdfIn PDF document text
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/lsqhi6fj5ah5hmbmgltu1r2nv3/74296793414.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609162fd9c21a---46143766712.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/mekadujasogogiwumurof.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/t6t0dem4v7nneu2mf8bcefhmta/kekir.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086cb87dd21a---83209991999.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/rusulipebikawinututofuvux.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/732e0034685c6362b5a12c0bc4cf04f7/xuzozosikavuborin.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/958c21b6cd1358facf7039a6986f1d41/81786174746.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/lagowipefug.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/nabowutisujamiruda.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/berazuzinewora.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/mebilar.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_off0000c177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC177 17128 bytes
SHA-256: 57005f890a1f71a155b84480c2f1e6c3f4ab7611c4ec94ab3086572e258ed1bb
font_01_sfnt_off0000edf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF6 10164 bytes
SHA-256: f3b73725a57e06ea2b57bbf89bf67227d26f7f970086e888452e47cc7114a750
font_02_sfnt_off000104b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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