Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8085b4cc03dacd0…

MALICIOUS

PDF

82.5 KB Created: 2021-09-07 11:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b63032e93b2632052b3fcff9550fc902 SHA-1: 07b97c99b668e5b6b8966931676b51b3bcbb216d SHA-256: d8085b4cc03dacd046af0738a22d14574c0cdc57e6de304c5bcbd8d811b46b73
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains XFA form elements and numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The heuristic 'SE_INVOICE_LURE' indicates the document's content is intended to deceive users into taking action, likely to download a payload. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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://wastran.ru/uplcv?utm_term=bill+of+lading+pdf+sample PDF link annotation
    • http://pietroquatriniarchitetto.eu/userfiles/files/dinirupewejiwebeluselutes.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/rotoxagafu.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/muweda.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/43011173805.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/nuvugozepefaxonaduli.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9d27b6a58---22348624288.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/99792281271.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/22kasrdjkf2mg2r6qrgpd4lq7p/rarorudakos.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/8495603540.pdfIn PDF document text
    • http://france-ex.com/pojilejiparobuza.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e922c6a524---paruvumumobi.pdfIn PDF document text
    • http://dejede.com/userfiles/file/13584792936.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/jamafetadadi.pdfIn PDF document text
    • https://ka-base.no/images_students/files/67426094136.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/0212938l2eqdrcd7gail2jdpub/roxifevikobekuvoxuf.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210606124903.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/f34d9aa9c2032bf9f7b9514c874b7668/53853183164.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/pizeg.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/juvinajabobifun.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/fakujovoru.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/48074687592.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/bosoburoketusoxig.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/pavuwuzudelixugot.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/mavejipuvuzafov.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/51ca6191bb5c84bd3676b24fae02fbe5/47510489585.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_off0000e073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE073 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88A 10696 bytes
SHA-256: 66f6b7d3cae2a571f1e844288a21ca882a021077e5ffdd0266da5fb7e205dfe6
font_02_sfnt_off000110ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CA 16892 bytes
SHA-256: bce5e5f4cb2a5a0071e64cfe4595a4e8c9df07255ccf876d585436aee555e7ba

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