Malicious PDF — malware analysis report

Static analysis result for SHA-256 409e3d3add380273…

MALICIOUS

PDF

118.5 KB Created: 2021-09-18 19:08:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e7747bebc3c3540354b1da821ee2786c SHA-1: 8bf01d263fa1be48098ef95920c27452d9e8ac32 SHA-256: 409e3d3add38027347d91b0e92937642ac3057fdb58400c1ac917f9cb137d981
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains or compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://garglob.ru/uplcv?utm_term=android+net+windows+update PDF link annotation
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/73445824198.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021091704534331.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/79704116740.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/fibup.pdfIn PDF document text
    • https://intersensor.ro/v2011/Files/fck_upload/file/durevigubojekun.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cddc61f1c3---1676816297.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/98321170662.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/33582167981.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/lusebisuf.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/6333599003.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/tuwanunulitajaridetek.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/81209998720.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/danaponapijede.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/16879644207.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/ribalebovo.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/ferifubaxedofo.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/1140a571f6313658a11a078649323e28/82068373273.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/83887001259.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/20984035920.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/vamozuwuxumevufinolapebuf.pdfIn PDF document text
    • https://ratodua.com/contents/files/48217380080.pdfIn PDF document text
    • http://monikaknoblochova.com/userfiles/file/56965915132.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/njr4cm2dg4a69karrko8gq78c2/mugipajesu.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_off00016a54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A54 10504 bytes
SHA-256: 159efac35fb66eb44f6f04c761bb359db0fed7f44153613197b12bf6a0b69c1a
font_01_sfnt_off0001826d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1826D 19048 bytes
SHA-256: fd954a13993361e0b67f77e9426680ceb090b75b20e2b169c81e69a0064daec5
font_02_sfnt_off0001b3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B3DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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