Malicious PDF — malware analysis report

Static analysis result for SHA-256 57e19cadcaec7547…

MALICIOUS

PDF

73.7 KB Created: 2021-08-28 04:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: efc10221d3d9678c44c07241eb621064 SHA-1: a3259de8165d9b6dbdfe1d1a4e5e28d32dac9d6f SHA-256: 57e19cadcaec75471ed5a95106d8582d6aa46c2ce72d7df27980d7a96f0b7484
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The presence of a 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the ML classifier's high confidence score suggest malicious intent. The embedded URLs are likely used to host phishing content or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://drafthe.ru/uplcv?utm_term=how+to+put+password+on+a+pdf PDF link annotation
    • http://shopcloud.cloud//ckfinder/userfiles/files/duguvubi.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/31588663912.pdfIn PDF document text
    • http://ukkies.be/userfiles/file/ribawepotesoxovelolopo.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/gomowarikejofe.pdfIn PDF document text
    • http://rideco.hu/upload/file/35790811457.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/mexema.pdfIn PDF document text
    • https://actorconseil.com/files/file/binaxuf.pdfIn PDF document text
    • http://slsnn.ru/content/file/10394496898.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4d13bd511---85910676028.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/97572791796.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd7b96cc55---6222595425.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/42402433718.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9863c2a39c---81362422139.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/0a0966a58c2165d74ecff1c903bdb893/javejosixedisenolofexaju.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/82425843568.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/74617945228.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608e35f51cc85---6280026790.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/59883980136.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/34981206426.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a559eedf70e---13308085660.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/nijusozopudexo.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/57711695918.pdfIn PDF document text
    • http://masseydogs.com/clients/f/fc/fc2e217ffa4851e49ca3cd921a15cf41/File/vogudeka.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f689005bf3---bulotepabalopamuvozusodo.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_off0000bfcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFCD 15700 bytes
SHA-256: ce8b74af08f7b30505b7e69bc2162e60f955af32253332ec1288d683bfefbed9
font_01_sfnt_off0000e803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE803 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001001a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001A 10400 bytes
SHA-256: fa1d7db253d753f0e2c61e6e452da5c6e3a3f4873be4921fdbd15f73b63c9aa4

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