Malicious PDF — malware analysis report

Static analysis result for SHA-256 436338ae6b67baa4…

MALICIOUS

PDF

83.2 KB Created: 2021-08-30 23:09:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 207e4c1d158876135d3e07b97342f360 SHA-1: d02289d8211bf577fe1205f25272561118dd08dd SHA-256: 436338ae6b67baa46ceb814b754c72d3675a8deafc3bfc13695e6bd4a6dcfc75
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve as a distribution vector for phishing or further malware, aligning with the 'Spearphishing Attachment' technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=find+the+inverse+of+a+relation+calculator PDF link annotation
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608438ac9ca16---gusikuruwogagefodevavafi.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/gegor.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cf0c3d03a---40495165379.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161117a21765e6---27670945819.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/7s3i0da5jbo98plhlnfis44as5/28254108907.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/25abfa2180adfd016fc41827f198e8ec/nebozaxuvimapibob.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/wosanakazan.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/wojutosifibepulokutu.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/94186a7e2d2bc3c2fc034b50bc2e7263/93496549418.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/22025039928.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/rofijajobexutivujuro.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/3141177776.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/81292856084.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa5386c28d---sivexunefeguj.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_off0000d775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD775 10716 bytes
SHA-256: c0f01d28b4aba0b68c71c7423bf9c5557f91ca75bba46f335b991363d21d0411
font_01_sfnt_off0000efff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFF 20612 bytes
SHA-256: bff0d9636d65bbeae20a90031a0d65813ddb49ed07acc9232ed85406d2dcddf4
font_02_sfnt_off0001261d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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