Malicious PDF — malware analysis report

Static analysis result for SHA-256 175c638047a30b7b…

MALICIOUS

PDF

105.3 KB Created: 2021-09-06 03:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2faf3c2d4a365177e60c2d97a0c8aa54 SHA-1: 01b04280510f9dc1617a586ce85edbd9007b8901 SHA-256: 175c638047a30b7bf3dfa75e54268a3ccf7a78eca695517319bc2d8e70e41875
156 Risk Score

Malware Insights

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

The PDF contains numerous URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to manipulate search engine results or direct users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://huntic.ru/uplcv?utm_term=tratamiento+quirurgico+de+glaucoma+pdf PDF link annotation
    • http://lpkgoodframeupvc.com/userfiles/files/gibapavakaruwogo.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/45314210063.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/tinukubuguka.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/0802462b06701d3de8f1623962bce217/44312550999.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f547278109---70414068166.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/nikenofurotokisezadupu.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///96822699271.pdfIn PDF document text
    • http://nkland.org/userfiles/files/51901614714.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/fafe0208053ae34fde06a0ef731c228c/siwexisigiwe.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/19496695785.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/59466363604.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/gimesebavipalupula.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/55093638461.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/1762290352.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/watozofanuxusanuwuwejod.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/3d55p39kfis3kvci7k1f11kqpl/bavibe.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/71554015044.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/10825169779.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/e62d5eb7e3dfb883a264b46acdf6d8ad/21340663978.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jugatebizudozose.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/lefafoniwiba.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/27326865548.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/44869024238.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/fetonupe.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a20a22e3f---xuvunuwape.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_off000131c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C8 19768 bytes
SHA-256: de6d868be1c6047d13868c05826ab6423a518e28872a24f8d6c7d9271ff6acbd
font_01_sfnt_off0001642d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1642D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017c44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C44 11004 bytes
SHA-256: abc8102ba81fd1f27946e454c30d4a94a1e5db2f53981662658c341628520c2c

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