Malicious PDF — malware analysis report

Static analysis result for SHA-256 79a0bea5a1abd1cc…

MALICIOUS

PDF

76.7 KB Created: 2021-09-01 16:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 9dce459385aaf3b6ec80cc71405efaf7 SHA-1: d1126448d72e4264e3c9d2bfbc5750f772368741 SHA-256: 79a0bea5a1abd1cc5583bc71cdf94b7deae71620e0e90daa5539fe4d6ee8401c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://podlahypilat.cz/admin/file/ramugoku.pdf In PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/78483300623.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/103cd6c3ca124cc3de7fc570dab561de/pidufajagutun.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/b48b333a694ea8046a88c32f4eb58036/bafawexaso.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/misumujimogafugoziwide.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/pedakunenejipafosi.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/83278880941.pdfIn PDF document text
    • http://cpils.com/userfiles/file/xufuwidelesozeguwi.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/b002481b6d4c7cbf4dbc8a73ad728c51/gojidorajigojazerewarokog.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5638979b4812e9fc281477ed9da30d13/63385384043.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/xiwimakevujazebotesin.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/14885409192.pdfIn PDF document text
    • http://www.bash.cl/media/file/goketelib.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607621140424d---5315653180.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/padolixijuvosexebosurodi.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/6pd5es1f9ihffjqrninobkbao1/40831536374.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/96e6d39a74c1ffbf982725899dc7cfd9/xafesevelalaj.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/44877177084.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b1f76b441---wapagudivomobofe.pdfIn PDF document text
    • http://integrotech.eu/zdjecia/file/88427717299.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160960bc3952c5---31808222528.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d614e8e7e3---7698583505.pdfIn PDF document text
    • https://webhosting4.net/media/file/womanevovozelakevivit.pdfIn PDF document text
    • http://signauction.net/userfiles/file/tukopaxagi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=most+common+pig+breedsPDF 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_off0000c9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D6 16904 bytes
SHA-256: d55310038e78472b2e6fffe1bb44b4074577ad4c9a8192dc2e4237d449161b2c
font_01_sfnt_off0000f4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BE 10784 bytes
SHA-256: e196e24ed03a29d31db05836e890aae6362307d3b516680b7a747a5c9bb14e33
font_02_sfnt_off00010d1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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