Malicious PDF — malware analysis report

Static analysis result for SHA-256 f49b1bdab0ec8067…

MALICIOUS

PDF

107.0 KB Created: 2021-09-09 12:37:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c9a2c417e5ed37a2bbecc1227ea7055e SHA-1: 8f0b9fd19ec9c608ac96d86885975501d17645ac SHA-256: f49b1bdab0ec806722d5563e568e7fcc66cc0ad6857c1b728523bc1fb6795980
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'SE_INVOICE_LURE' indicates the document's content is likely a fake invoice or payment request, intended to trick the user into clicking these links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9881

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://krisoc.ru/uplcv?utm_term=split+ring+commutator PDF link annotation
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fc7e3a7fc---molanadifebita.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/60875075005.pdfIn PDF document text
    • http://ahchala.com/img/file/lefolabirijiwab.pdfIn PDF document text
    • http://indianapit.thriftstorewebsites.net/flash/indianapit.thriftstorewebsites.net/file/30116770002.pdfIn PDF document text
    • http://telektrans.hu/editor_up/19649510741.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/82628063382.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/9393941329.pdfIn PDF document text
    • https://poker-fire.de/file/netonolimebewudurutekoma.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/78105084279.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/56668719673.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/57156322152.pdfIn PDF document text
    • http://thepducphat.com/upload/files/46069133646.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/sebujatawezabavive.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/doxafidotubapatadad.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/87649154752.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/10810365492.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/69887702416.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/fuvevamesenokesawonevub.pdfIn PDF document text
    • http://iphysiology.ru/upload/zarategakagikexevukepes.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/vimef.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/kupemateruxugipotijukubas.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/47898347358.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/26517928643.pdfIn PDF document text
    • http://lejuriste.ru/files/file/77530274950.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/5180c46698e1de6abff6fa1331bca157/26804965958.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310196a79f4---88363154450.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA1 10592 bytes
SHA-256: 0ac39fee2c07f53b0e93daf45bdbfda4512f1eaf5dbc3e1d42254bc5d56cbd3c
font_01_sfnt_off000153c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016bd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BD8 19184 bytes
SHA-256: 0f70ba2be2fb5c284239900d8a9180f6fb36e782e0a360ff0667a7756d478051

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