Malicious PDF — malware analysis report

Static analysis result for SHA-256 87189cb5014d869b…

MALICIOUS

PDF

71.5 KB Created: 2021-09-27 15:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: bba85931506e19927e2cc787f1c52297 SHA-1: 7bd614f126a4bcfebee286df5e0f54c6375a8bcb SHA-256: 87189cb5014d869b4081292db428e517bf3245f98f61e5aff9bc73da678d2647
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs and PDF link farm heuristics strongly point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=download+game+android+selain+di+playstore PDF link annotation
    • http://dainindo.com/Uploads/userfiles/files/futusawinosi.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/lijodub.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146801ceceaa---tuvepisodebuf.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/daxifililudijeveja.pdfIn PDF document text
    • http://xn--b1adrijbbb.xn--p1ai/upload_picture/85845222571.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/vamarudofa.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/82917644201.pdfIn PDF document text
    • https://textosolutionslinguistiques.com/upload/editor/file/mefowizozu.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/tukabe.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/492eb7bed7b5eb94a4825505cf93b74c/kisuvumidupopaza.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/81136676112.pdfIn PDF document text
    • http://study4student.com/cache/fck_files/file/jufetopefanojesozake.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/63807436416.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/wuvejopimu.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149509b8d9f7---81180060512.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/c0fdb70bc141ea947609b78e61ac4785/folomiza.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/raxavukuxozuxozilazi.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/kixizit.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3513d15d50f85755ed1e731a59bd2f37/vatojokosu.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/13227879637.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16144c84f4f4d4---84443388884.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/5c0f4dffa815767ffaa6122212c932f1/32338617078.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/gezezo.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16131697bbf688---10267404039.pdfIn PDF document text
    • http://runhouchem.com/upload/files/lilobomibi.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_off0000b5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5DC 10936 bytes
SHA-256: 9b246d00477a8252313d7d8fe938a0159ee306e5777ecd28e32542f324bd46c3
font_01_sfnt_off0000cf06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF06 16516 bytes
SHA-256: 57f8bd2f5be136a452e783dd7de0e3560731cc9fc5f83ea76f043003514f9ded
font_02_sfnt_off0000f8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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