Malicious PDF — malware analysis report

Static analysis result for SHA-256 913577f6529dfa77…

MALICIOUS

PDF

85.1 KB Created: 2021-07-08 11:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 48a22c927fbaf29925170fea42d09c8b SHA-1: 4e5acd28ef711c0c58ca5b557fcf872149c4e040 SHA-256: 913577f6529dfa77a279b2793c3cee5ba6c3e997b5110c031b3f2f47a8df2f7d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://oniceh.ru/uplcv?utm_term=admission+open+pamphlet PDF link annotation
    • https://balajihighfields.in/userfiles/file/22569336326.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/45598501176.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/jadufox.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6db09648d---7009934180.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/kapiwekabojafesikirodugon.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160abb1daab780---doroduruxojozogomod.pdfIn PDF document text
    • http://meskerjager.nl/media/files/mulavebupezamazojoj.pdfIn PDF document text
    • http://asustainable.com/global/file/laxiwirotixanenegimeti.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5baacee4d---boloxewumibid.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf175c0026---debirikimukusa.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608528d5d5788---62428239433.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/13549395375.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb744a3cae---42870007366.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/54650186051.pdfIn PDF document text
    • https://turbooto.vn/upload/files/80135951729.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/gorineseviposuw.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/41619062909.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/xamusuderebatobekitib.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/82544979046.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/wusopog.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/55381516690.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/fupalamijufopa.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/1151357389.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/9fa1f0fc43d72026332ae6df16e4fcc4/80754253714.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/12338442645.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_off0000eae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE0 10536 bytes
SHA-256: 95b2940d9a9b77ba2d25cb474de1189f728baa36b9829cc4d9c4d51c60852e9a
font_01_sfnt_off000102a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A8 17276 bytes
SHA-256: 41de5d533fc6cb5eb7e60571787d4a7b8b5f4331ec350f8a419aaac2728fc4c0
font_02_sfnt_off00012f72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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