Malicious PDF — malware analysis report

Static analysis result for SHA-256 8976ce91457d41ec…

MALICIOUS

PDF

90.6 KB Created: 2021-09-05 11:37:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 3c7c96eb632ddc49ede9019a77ab31d0 SHA-1: 39f1b797ddb2f8355134b266cc23ea55849943e7 SHA-256: 8976ce91457d41ec6b5161903dfb0510e09c549c585cfcf6c4487e1d5596feb5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The primary attack pattern involves leveraging these links to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/d7a0390738824e4b68d1a4154113cc9b/50527677039.pdf In PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160781e867c0d6---zukuxi.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/kudilolakavisezap.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/94205606483.pdfIn PDF document text
    • http://momsystem.ru/public/file/vasaratulumadu.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a11210e0e74---27169714722.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/gefotikifewovuzepuj.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/mejewarexuregabolaxumipuk.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/nelaselivoposijak.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/4d138c7088b2a2e5a32712d276dbbd63/xukugisujukasokodupog.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/90518584053.pdfIn PDF document text
    • http://forspeed.cz/ckfinder/userfiles/files/56367746529.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160735cc71c178---34625626824.pdfIn PDF document text
    • https://123natura.com/stockages/files/43570190780.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/monekiduneretireganeza.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081985d445d2---digurazo.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/21181ba832dd5b0db9704fa7eb776e9e/jawolasujukimaxiv.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/e370feb041747db64e092443811df7bb/59357341786.pdfIn PDF document text
    • http://stepsforstarlight.com/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/zolufadimisize.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c21f3b10b1---mojasufifu.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/9gh7ltrp50elsaoertl7v2c0m0/83716898958.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16090a36e8e1a6---24788554785.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7ccd58db7---ripazo.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/30900537624.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/99499299092.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/siwinifugidelarekiwug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=filologia+germanica+onesti+pdfPDF 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_off0000fa76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA76 18648 bytes
SHA-256: 05c84a4018bbeeef4b7083d94f2499f76958c9b97d997649743666b726701113
font_01_sfnt_off00012b2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14346 10940 bytes
SHA-256: 3de5d84f1ed03cc920f5044a71100aa49b6759c86709b1c6060de804f81b7212

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