Malicious PDF — malware analysis report

Static analysis result for SHA-256 96e0f04c616cfbe3…

MALICIOUS

PDF

78.5 KB Created: 2021-09-06 12:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ea6c274eb5028b491d67864908e49d63 SHA-1: 163b21331aec91ab65856127a651f52017b747d7 SHA-256: 96e0f04c616cfbe3be63a4243f2efaf3ebcbc191e321da6de8a1026298a73f21
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on compromised CMS platforms, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://smidgel.ru/uplcv?utm_term=charles+county+public+schools+calendar+pdf PDF link annotation
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084ae20a4547---xubosupo.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/0f0645fa18f2b3a76853edfbdae042cd/senagekorokofazaj.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/1cfe779f1a338a2499770f1d658c2a26/wetuzizuraxaledezeribud.pdfIn PDF document text
    • http://web5gstore.com/Files/files/tofituriwelepuxajo.pdfIn PDF document text
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/7057436739.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/81099256495.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/sidinoferunegudu.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160732ee8eed1b---luvuvat.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/66976349060.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/2050cc836e30c8f3bf70eb2467f74a3d/wamakezupukozuwa.pdfIn PDF document text
    • https://franciscojaviermoreno.com/DocsCKeditor/files/40162298403.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/tadumif.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/warovanamabanu.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/tonofubewo.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/34313615639.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607449628c4ce---loxufimi.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/vizivarosal.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/pugerakati.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b491a423813---kupaxu.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/q9o9kijcg0l02fnmdcvcfec9fb/pagejezujilopidukonale.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/sesefotu.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/75726583459.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/f8415301018eefe2f7f6f6ebd53342db/famuso.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_off0000cce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE5 17688 bytes
SHA-256: 7abbf592bf61d7b6d4808c72833d6dfea4d6d66eb562407a25422810c7e1d045
font_01_sfnt_off0000fa9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B1 11104 bytes
SHA-256: feb059293fb80c2a9f5db7af165736cd499547b1cea072a81fb1dedd5fdf12bc

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