Malicious PDF — malware analysis report

Static analysis result for SHA-256 80f454e1d250a5ad…

MALICIOUS

PDF

109.6 KB Created: 2021-09-01 13:23:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4be546651bc4c30b0fe21df677e1d44c SHA-1: 084061c93d7c771b8cba916a4c5a001dc704cadf SHA-256: 80f454e1d250a5ad7c5e64c70252e60df552eaed9760233d08b3712e55fd1d7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload delivery. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure align with common techniques for distributing malware or conducting phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://irlanc.ru/uplcv?utm_term=noam+chomsky+what+uncle+sam+really+wants PDF link annotation
    • http://ahkjt.com/upfile/file/nabopu.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160777ca2cd72a---xorejiluxobavad.pdfIn PDF document text
    • https://gangnampools.com/contents//files/32874080342.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/50320759664.pdfIn PDF document text
    • https://mmszke.hu/files/file/lawuxurefupekato.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__60D2488E196E2.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/patotezeretoki.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102f8ad7b5a2---jiletetus.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/71f5a50c35f7e3d5b576b0eecb6a2dc7/95052369289.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/e2fa4f15ec85ad3207006684f88716f4/99336834512.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/7afa2atuj4vqqossvdf97rdrk5/25475423106.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f13d7e68586---mesekezisopovi.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/44994813792.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/161195f2c3494f---debugadupawinuwoxav.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/sasirate.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/4d7c7dc0fcc0e5484e83b7b5e6d2a315/xizevubapubovenewip.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/088b88cf958dbaf2cd2b6255a0dea326/91333162125.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1611af3c1256a2---suzirowoxevilikomodewul.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/35008755253.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/motekafamovugenirazesus.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/f2e0643976270d003b29f5c65d7d17e5/56015261792.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/6375687347.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_off00014435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14435 19268 bytes
SHA-256: 04f18f2c7ea640cb0f4af24ea21f4c6ccec166ae4a50f0114d11bfe94f166370
font_01_sfnt_off00017689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17689 10772 bytes
SHA-256: 60cde4b8d4e8cb2caba116b20d679d137cf570af27cdbf66b442db9e9de2c6aa
font_02_sfnt_off00018f4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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