Malicious PDF — malware analysis report

Static analysis result for SHA-256 70c8f6cdf92d7d35…

MALICIOUS

PDF

72.5 KB Created: 2021-09-03 18:03:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e1dea05d0f0be5e13e27a03ac55b938b SHA-1: 87efe5c41dde00ac1c7f0d2d76fb362088f1e6a7 SHA-256: 70c8f6cdf92d7d35e32e9f0346749d6ef64945d4cfec14096790589e58293978
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised websites and disposable hosting. This suggests the document is designed to lure users to malicious sites, likely for phishing or to download further malware.

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 http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/aeb0ac67752f09e103353d1d5a538df4/75762651182.pdf In PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/tonojurixanefax.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160881c53d1b7c---medilavujavijawazalokaf.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608091eb99227---33784277692.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/83961054909.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210728_154920.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/wuwowaluvurawenepala.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/4289a3986ecb3c729825291b4b4c0240/mivetufuwurem.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06ce0f3258---72887947763.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/82cbftihfoav66h2936mj9ifd0/72546619977.pdfIn PDF document text
    • https://sapsda.com/SapmaUserfiles/file/27061156002.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/sipadog.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160f16527d9e35---39088571278.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e286bb4b78b---23382527152.pdfIn PDF document text
    • https://ecole-anglais.com/upload/files/zomexarekotagupip.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/4a02bd3627aae73332f6135dd84df423/pazinunapotejiruwus.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160faed238c0c3---97187527425.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/5c2e6685c08d5c921a3016a37c2b9681.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16084814218251---83239228999.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/7895132115.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/i25a47e17pauvvm49cmoo98dk2/82878909339.pdfIn PDF document text
    • https://gotamsui.com/ck_imgs/files/rexajiruf.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/vorubukefawetutumuton.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/febdd109c68d812bb498c7868b236ba8/52511003201.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=ethiopian+foreign+policy+document+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_off0000bb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB5F 15448 bytes
SHA-256: b7368d9a1a71a80dd3e7f1880e503451fc76815b5cfcfa930ab7ceeb367bb554
font_01_sfnt_off0000e275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE275 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8C 11096 bytes
SHA-256: 462d7bb59cb0f5f72903b8b3719573b157eb3bd7eea2e69465a74be84d91dd95

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