Malicious PDF — malware analysis report

Static analysis result for SHA-256 16e859ae9e19eb23…

MALICIOUS

PDF

83.5 KB Created: 2021-09-03 05:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 55abb20455a8f87a1471d861128d79c0 SHA-1: cba406bfdc60f9fd95a05de233b3cf0f612b06f9 SHA-256: 16e859ae9e19eb23f67a4827277c72b565e915b15726fa9b9f3ebbaa818fad1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to a variety of websites, including those hosted on compromised WordPress installations. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the heuristic firings suggest the document's primary function is to act as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://inwebjor.ru/uplcv?utm_term=pdf+file+name+to+text PDF link annotation
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ed8d554f8---48717819018.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/92201243772.pdfIn PDF document text
    • http://tanphatinst.com/vietkiendo/upload/file/17530409938.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/4g200brref44d9tca5mc1rso3c/guxojulatiweresive.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/joligobogifenigewabinu.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/gixapukek.pdfIn PDF document text
    • https://majubesar.net/contents/files/gerolusasebizamipugi.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/5160991890.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a88e2beb451---42163006274.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/51984014382.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/26264004517.pdfIn PDF document text
    • http://betaempire.com/uploads/userfiles/file/file/78996314502.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/e7ede1a389c19da6253a8c9f1589e4cf/47967363772.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/qfr07nubembet78o575l4t441r/lubomejimetuvixekibiviri.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/mupipikupafejubixud.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/lasosivejasogukix.pdfIn PDF document text
    • http://jsdarvin.com/files/vodinexatugusowogi.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/mic098cp799ul2q31302fh2cu0/falisikatixusafoxan.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c2189a270---42979168262.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606f28961fff7---palipevuwelozorizinu.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/tizawumonomepemisexoberok.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/39079378785.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/a998b40a7f20f22ec4a18df246b1d263/gebupova.pdfIn PDF document text
    • 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_off0000e2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B5 10352 bytes
SHA-256: acfc773a6e55e600be93ea0b7a0ab4186e449766ec984dc0840b6275c4df2095
font_01_sfnt_off0000fa04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA04 18044 bytes
SHA-256: 5aefe929c9a46594bec866e5b500a5fbf11ea060a4e7b8438ccfab4ac58c5fb0
font_02_sfnt_off00012864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12864 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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