Malicious PDF — malware analysis report

Static analysis result for SHA-256 63917019fe108f5d…

MALICIOUS

PDF

69.4 KB Created: 2021-09-04 00:49:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d75d47ebb01ed6cc7d1fe42b3f5bb3d8 SHA-1: ba0500e6495d4ce489914b8104a38a6726cc2583 SHA-256: 63917019fe108f5d2637f743eea71516979b2a23ecade40e6eeb05643716e015
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to external sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://coretry.ru/uplcv?utm_term=molecular+chaperones+pdf PDF link annotation
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/6018626975.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b8dceaa3f---tufizopujago.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781579978e7---notowapudi.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/feneboxudiso.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/remuzosogelegaxomufaba.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/ruxufuko.pdfIn PDF document text
    • http://chretkinia.pl/userfiles/file/rodajafinurafexu.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a576b294d1f---raxezitolive.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/sagekevadopokixob.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/rrvdvjh809rva05tgc3jq61p72/walozolidinagut.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/1ed0519ab2fc2be5ba1ffb832afc3310/20379679220.pdfIn PDF document text
    • http://zjpjxt.cn/upload/uploadfile/file/91225985702.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da5a2c9db4---biwujivituvogu.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16124b73f327e5---fuvivan.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/15570715389.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/vofirubopovofutazike.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/nevamijesada.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/45320575502.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bae1fd672f3---munalotarodiriludebed.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/99816801466.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/83717379239.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/ct2nctrdleif1bp6e367nodej8/likepupinuxepe.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609b414c6884a---tojopegafes.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D7 10620 bytes
SHA-256: 839bafb6fac2af5ffc98235bbbcadde6a42bc9415805ebc8e7e57077e3165325
font_02_sfnt_off0000e208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE208 15112 bytes
SHA-256: 02f2f479d69043bcfacc0cb21a81172b7cea00d9db32307f1aee8e517a1754c7

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