Malicious PDF — malware analysis report

Static analysis result for SHA-256 d35efae2f182b6f9…

MALICIOUS

PDF

102.8 KB Created: 2021-07-23 03:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 46fac90aeda404624c0f8eb8f0bec1dd SHA-1: 497e0dbc1e113648b6c0502254c1b602331b568a SHA-256: d35efae2f182b6f944b35752765798e46bf731cf7a4cce63f556bb2119df2a76
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and embedded URLs are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a1f02785e---24822673045.pdf In PDF document text
    • http://belst.by/upload/file/direzivexufofekezemenafov.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/kgdd8ip1s3938i9pouoacngvj7/tuvukumatebinu.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/07u98hp3e38j1urcq6pgj1c55o/44793961657.pdfIn PDF document text
    • https://sayurmateng.com/contents//files/vetag.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/puridavaxisepizunor.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/28117447120.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/24db2f7a10f63455dc73253da56225b5/giwemupufowevidevex.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609842a87db58---tisexor.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/42762642624.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/77ff5f36de2654b721a6d8df49650e87/3223011752.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/tavusotegidu.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/89460006144.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/an7e073hpqs4a6jmgcvsqelo14/notukejevibobesivatogaliv.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/f09ca351200085b77ceaff9ac21a2c62/wukavubid.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897a4ed7e27---67904376082.pdfIn PDF document text
    • https://jagominum.com/contents//files/zujodijesigebet.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/aadlf64v2jo5jjekc9a0ua019r/xudokumanobadaxedat.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/23763518282.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3a6800c2a---viribaxatuguzafolar.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b28e96f18c3---56120691639.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/zowidetexomuwenexanagino.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/saroxajodirizuximi.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/2b80e98a25aceaabf450b4c773d3e5cb/bagemotidepigewikanudem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=manufacturing+accounts+example+questions+and+answers+pdfPDF link annotation
    • 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_off00012be6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE6 17300 bytes
SHA-256: ec72ad4343edb00ae47bc29ad238e8ebe81b3ad08d47a7056318ae7911eec845
font_01_sfnt_off0001590c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1590C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17123 11392 bytes
SHA-256: 247a1afa5b36a77935f58467d94c019f3e3a8b2fbe15378843ebb7ef088e5c60

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