Malicious PDF — malware analysis report

Static analysis result for SHA-256 219646fbe99dfab1…

MALICIOUS

PDF

84.3 KB Created: 2021-09-02 08:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b07e191a966f36f6a9ef4cb9a33b7d76 SHA-1: 83eb0c1efacc8a076fe87ded85de5e366fe1f607 SHA-256: 219646fbe99dfab1bc5fb5b6c674619bfd61028525156b9ef4f1ec89f37b9f1a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://coretry.ru/uplcv?utm_term=wef+competitiveness+index+2020 PDF link annotation
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/mixut.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/boxob.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/tegokotiwuxifena.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/legajexoro.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/45537024928.pdfIn PDF document text
    • https://cape-electronics.com/media/file/26096923961.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/86877847059.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcddce20fd---guniral.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/woxex.pdfIn PDF document text
    • http://masonhn.com/d/files/bawuxotoxuwaxejulap.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/e5d2888799f24a28c05a4038093943d5/menojanomorosuwekezukukix.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/guzusulojaxapelovo.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/hrt4fdd5gbrf9t91p76bs7up7i/divilidikoxizuvubefur.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/828c8e328ad074ee5ad7e3a7bb0b34ee/kavilurafobezozeliz.pdfIn PDF document text
    • http://geosond.pl/userfiles/file/tovinagidoxe.pdfIn PDF document text
    • http://technocom.pl/editor/file/57617411978.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/r92oeko3k5imqo8pta1u1qp0mn/sovodipopuxipez.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/66316121785.pdfIn PDF document text
    • https://bedandbreakfastholten.nl/userfiles/file/13167236470.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/34e8ba4502d9def33888979c7b3cb21e/gozepawubapug.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/57043811629.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b6bf1eb85---92294806441.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b715ee3bc---43722021427.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_off0000e322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE322 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB39 10876 bytes
SHA-256: 7831475d6abf7beff083eab25096305d222471f69ee278162ee116db6966d4f9
font_02_sfnt_off0001146b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146B 18084 bytes
SHA-256: 67d8d98efaf708dd988c39f807cfb6af98d9270edd12b4335efe0a1b9b4b6450