Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fc6bab25c6c9ac3…

MALICIOUS

PDF

99.7 KB Created: 2021-09-06 02:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 540cb76593abf7b5dcfe40ecd0976ace SHA-1: 22ba04c6b3ab8516c0025c1a0ba7c9e1df11a1d2 SHA-256: 4fc6bab25c6c9ac3c651aa4ba906db5de78f4750f2f60ecf4c11cfd34ebef7ca
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS uploads. The ML classifier strongly indicates maliciousness, and the structure suggests an attempt to manipulate search engine results or redirect users to potentially harmful content. No scripts were extracted, but the overall pattern of link distribution is suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 5

  • 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://kalyna.ua/sites/default/files/userfiles/file/gakip.pdf In PDF document text
    • https://hotelexpert.ro/uploads/files/87058367949.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/ba7e8c2cd620485432a781fb5ee847cb/97414596142.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/3a753f986951ddb9130bbee122d73746/80541010562.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/lamogawuvejokuwurewijig.pdfIn PDF document text
    • http://newworldss.com/uploads/file/96015529295.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/58424918947.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/xumun.pdfIn PDF document text
    • https://masihpt2.com/contents//files/45452097899.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/gafopegopunis.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/gefirajemi.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c13f6915a12---94627075603.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/pi78dkdjfoo89g62748rhtjc37/limanekozotititeduluwug.pdfIn PDF document text
    • https://slide-bearing.com/d/files/fopagosubogejawew.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/a2a7b671bfd02c397b7f108c5a3ee32f/14371620838.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db77c8ab479---40166357031.pdfIn PDF document text
    • http://poiskvod.ru/images/file/64910699294.pdfIn PDF document text
    • https://aedwea.com/upload/foto/filipim.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/b37c8faf1cf2c0a0975450c8a745bc2f/rikevobixumodusanelizew.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/95mmk66qb03dd0i6fj68rqh2vu/96773560413.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/27970503364.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/buh87rf91dptsu2o5bd4tocc0b/repaguxubejaxabovazofufig.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096bc8a6f43c---60622050140.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/26835416505.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=pulse+jet+engine+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_off00011da2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000135b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B4 19944 bytes
SHA-256: cea5fba4efb5ad0e0efccc0f1420f160777c1e1b02f1dd6b4fc2c2671112b8a5
font_02_sfnt_off00016958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16958 10520 bytes
SHA-256: e70d50543e4e53535704e2b8ba73963e6b8288981533c954d38f767b7d1d9c42

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