Malicious PDF — malware analysis report

Static analysis result for SHA-256 75bc8e4f1a237cdc…

MALICIOUS

PDF

100.9 KB Created: 2021-09-07 09:09:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c603d7bb790112712adb101331c0b11f SHA-1: 8b9ddffb8f8f0a40a3d4516210ce571cb866c005 SHA-256: 75bc8e4f1a237cdc89150aa4f6e2d82ceb29bc2217849ae52d7127bf5ab60ec5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The presence of numerous links to compromised WordPress upload directories and other disposable hosting suggests a link farm designed to obscure the ultimate destination or host malicious payloads. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://myarrahnu.com/mo_images/files/60331409476.pdf In PDF document text
    • http://sity-luxe.ru/userfiles/file/wapulugivowazarusetevosas.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/3f31a2d3d59d649f9ea6339663afba05/11757216377.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/f8ec51df14527b85217f25c097b55ec5/siwubov.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a71efe18ca---bobogunibukewevotelez.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/fatowalebegulavunebibunov.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/2136039399.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/bezogezeju.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/59676736740.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/51287615255.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/d83fb7a33fd9d5f988df5d622e9903a9/rewipebifuvapekovezez.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/7hrs0sca6jdlrh4pdsb9cucuh1/46364489118.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b4f379f02---74816981181.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/vukuxevofadul.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/sozigijipud.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a841984676b---50508012592.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612cec3e99e37---99805380167.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/99063216672.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/lepanuxorudasudozefi.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/bugaranojod.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/dedekov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=panasonic+shaver+es+lv95+manualPDF 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_off000123cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CF 18888 bytes
SHA-256: 4d90aa294db8018c00cf0443d90fa84c974f2b401408f96c305489059da5fc69
font_01_sfnt_off0001550b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1550B 10868 bytes
SHA-256: 08854dfda09c3491bca2d186a438c8ae31ae83c42102324982f8836ec5a087dd
font_02_sfnt_off00016e0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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