Malicious PDF — malware analysis report

Static analysis result for SHA-256 10107d54fe784536…

MALICIOUS

PDF

82.4 KB Created: 2021-10-06 03:34:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6cf5e762ef7a6f15fa68f4081d8861da SHA-1: c614a8fe8883d76c2c434e4d451d8e59b09b884b SHA-256: 10107d54fe784536c474843cd0653946867a98002ed305f4115f38ddacda55ee
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of embedded JavaScript and numerous external URIs, many hosted on compromised or disposable domains, strongly suggests a phishing or malware distribution attempt. The ML classifier also indicated a high probability of maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=cancel+subscription+on+ps4 PDF link annotation
    • http://checopharma.com/upload/files/59228447972.pdfIn PDF document text
    • http://a9188.com/upload_files/art_files/files/20210906_212951.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/defixizekov.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/37749422538.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/fetipasumawije.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd7f3a1ddf---nivedagameg.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///48730139242.pdfIn PDF document text
    • https://xuongkhopbadinh.vn/images/files/4443264418.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/luzubazibaserilu.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/59877446420.pdfIn PDF document text
    • https://giaiphapthietke.vn/media/file/files/puwenavarovuxasuxexem.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/53175047662.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/lagas.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20211002205806.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a96405ba93---51420529111.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/83012930885.pdfIn PDF document text
    • http://thermocomfort.ca/userfiles/file/91148599244.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/ginuvagumigumafokabireda.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/susigav.pdfIn PDF document text
    • http://airsoft1.ro/files/file/papuzirozu.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210929_060741.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/25291153144.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/25acdfa48bb012a9d742357e4dcc22b4/83844952300.pdfIn PDF document text
    • http://erex.hu/upload/file/70476045616.pdfIn PDF document text
    • https://stotex.rs/files/447705114.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_off0000dd7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7F 17672 bytes
SHA-256: cc3bae7a766573f4a4ca81c8e446833aa40a91c2e8427af9a261d64010c32ddc
font_01_sfnt_off00010b4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12362 10716 bytes
SHA-256: 3b287842391f6b15a87c56aa6b2ab7da30bd26c3e5d6c3db8a6bdd55a4b26733

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