Malicious PDF — malware analysis report

Static analysis result for SHA-256 49c69479b2f58938…

MALICIOUS

PDF

84.7 KB Created: 2021-08-12 11:01:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9fe805df42f0dc52893a19c27874198a SHA-1: c60b984d211897378b65ad2d7eed9c777126f6a4 SHA-256: 49c69479b2f589385bbe3e98b0008634459e3aa19896b55a4353ed97c5425369
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous external URLs, many pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • 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://basisnomor.com/contents//files/zeranurolebomuteva.pdf In PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/37dc80819d9b8eee07976f61ad6e3c05/26482901731.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/widiradomevuruwoge.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/88864653494.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/fumitabar.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/97415138822.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/95720119653.pdfIn PDF document text
    • http://uticahighclassof78.com/clients/8/89/89c70e22fe5ad1405280b455f64975d7/File/60960184493.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/8428c48427adb67a0417693e525df835/fitoxufijazen.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/72039935323732ddca068f1b2927ba54/fagefebufaxitedev.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/86018967526.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/xutomud.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/seha7ct5c4r8c9p7cd4q0arttq/zizilefutuzibutugokawalap.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160780e143d903---lofisizejitunisafujunonu.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160712e5847fc3---subivufibezokogo.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/k7bfvakgsci9l4jl2n68s62ed7/nawekebasegep.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/terivixalipobinen.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d55778a4e14---15665972464.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/fefiluzakunosume.pdfIn PDF document text
    • https://bajrahrs.com/userfiles/file/kirovoxo.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/72856371919.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/mereradugawoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=d%C3%B3nde+es+la+barrera+del+sur+en+wwe+2021PDF 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_off0000e199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE199 18652 bytes
SHA-256: 022ec1a5bddf8f8d54b1e117f02d4ffa4eb887ee8ee9f5cbdf5c018c0fa06b7b
font_01_sfnt_off000111de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DE 10688 bytes
SHA-256: d7f1b42c3a22f31eb84b2c031303a93da2db0e01d2aa7788759376be39ba9719
font_02_sfnt_off00012aac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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