Malicious PDF — malware analysis report

Static analysis result for SHA-256 b328b4d0f6875e00…

MALICIOUS

PDF

77.4 KB Created: 2021-09-08 03:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d5b9e6c3def6fb505ff75d7e94c51148 SHA-1: 58dbdbb01c83a839d756accfff3c74c6f825518d SHA-256: b328b4d0f6875e001b6e8e5884230624224888bc809ccb42552adec2afc93d7e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to lure users to external sites. Heuristic firings such as 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly support this assessment. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160793d8cd893b---80757657943.pdf In PDF document text
    • https://embassyinvietnam.com/webroot/img/files/19772971772.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/ditenujefejimizonuruzakab.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/9f304cdfd2ed191edeb8d5d50e855b85/jexebesifuxese.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/99117496939.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/63471637302.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d9e39ffad---82185899851.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/99878814490.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/26453566735.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/3b1b098ecc9ad48242fc1c403fe4eb75/66037045938.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/122980764e5ec99466d2da09e31e93e1/nuzumupalupovagegetepaw.pdfIn PDF document text
    • http://centrumbiznesurawicz.pl/userfiles/file/2399431484.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/83247229091.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/56784784580.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/mutefemujekarevuv.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/32e7762d7d0798bbc4e3b22745d80ba5/67015298110.pdfIn PDF document text
    • https://tsegypt.com/file/73676008096.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/lifunovanopusavil.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/zazejedinukarenisov.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/d1873a46b157324afe90ba36a4f21b2e/20982705298.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/niderekoxibagobu.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/pumato.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=namorado+de+aluguel+pdf+download+gratisPDF 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_off0000c48b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC48B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9D 19252 bytes
SHA-256: add6693c128124048e05119e08f51ba675d0d7f5d615240fd38e53da619b5c38
font_02_sfnt_off00010e2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2A 11004 bytes
SHA-256: c23937a8738b7eeecf9551ab7255fcba47a9ed320e5f57d3136ea0cd08552363

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