Malicious PDF — malware analysis report

Static analysis result for SHA-256 57348d6ace9c2f2a…

MALICIOUS

PDF

80.7 KB Created: 2021-09-23 22:14:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f96761dbb496bd954bf897848727a71a SHA-1: 1e5e824b8148441be8f8079f94fdb2243cab3019 SHA-256: 57348d6ace9c2f2a9b93b06bd5610205f27c2658eebdc58b1230cd1d0e4835b9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many hosted on compromised websites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports that this document is part of a link farm designed to distribute malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/uplcv?utm_term=movie+maker+download PDF link annotation
    • http://viettelhaiphong.me/data/dulieu/files/92610363311.pdfIn PDF document text
    • http://tradotel-riviera.com/file/femagizumuxalig.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210910_D47C9325F1F1C052.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/50704844017.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/vuzizoti.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/firofefuwuxumur.pdfIn PDF document text
    • http://signauction.net/userfiles/file/28186034837.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/615d3nt0qs3qkcg7kc7qpasjjb/23033283390.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9c1698e70---45113040055.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/jixoto.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/78335936034.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/65777881781.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/60610005381.pdfIn PDF document text
    • http://directartdeal.com/uploaded_files/userfiles/files/ziroxakazuzubo.pdfIn PDF document text
    • http://st03.it/userfiles/files/guzizalubupadepiwuj.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/vujuxokaziwire.pdfIn PDF document text
    • https://hongdung.vn/ckeditor/images/files/pikusuzasozamapaxowosaxo.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/suviralug.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd9bcaffd8---3647673156.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/xazoximuvavabakali.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/lifetadazowojukulewi.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/1632232993.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/26241939923.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_off0000d96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96F 17172 bytes
SHA-256: 8344cc27fcdb200590e86ac9101770ed2acd7eb30197621d2fb060be90441930
font_01_sfnt_off000105fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FA 10380 bytes
SHA-256: 36376a29c90775c58be93a30570ab8840bbf5b60c4fde0342fda9e6c26670616
font_02_sfnt_off00011d6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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