Malicious PDF — malware analysis report

Static analysis result for SHA-256 f19dbda20d85058e…

MALICIOUS

PDF

80.5 KB Created: 2021-09-06 12:00:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 96da3aa9c354746b35994dae406f317c SHA-1: 56d3fee005c8d27d0cadc060e7464e5acfe5e5a4 SHA-256: f19dbda20d85058e0685e1815aa48493a10e58ae9120b67cb0fb3563cff1fed2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document.

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.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608927b791270---69183977242.pdf In PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bb925658e---fexutoxolaxigemevowevavi.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/defelutobudutam.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a97838a82f---14196581560.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612527872caaa---mefidagaxarojajerupusew.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/ditobemedajidegudawikewu.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/60072477470.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/zeluba.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160868edd8cd8a---majokatukikiwabepu.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/69710248911.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/53701231300.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/708a444cbb82dd68462847fe9a2b96ae/punifiwazed.pdfIn PDF document text
    • http://www.motorradfreunde-toggenburg.ch/up/files/15737733924.pdfIn PDF document text
    • https://tonitomov.com/picture/file/medodatuvodolebujipeza.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610fbe5a62345---lidogom.pdfIn PDF document text
    • http://greenbrier101.com/userimages/vamekukuwixadetopi.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/791817bdfd6ea622b12579222433dbca/rikiguvejo.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210808_E1B1E10A557EB7CF.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/80350845722.pdfIn PDF document text
    • http://micdelhi.in/userfiles/file/kelisi.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c731dc8e2b---86626276296.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=ncdex+holidays+2019+pdf+downloadPDF 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_off0000d333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD333 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB45 17980 bytes
SHA-256: 01b3d84ea1b085f226b6c10531dfc7cd65bf747199c86201b0de9b29b4bb2706
font_02_sfnt_off00011a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A37 11260 bytes
SHA-256: b63b9839dd4bb0b9973c903e3d7740352f569799d240d4a108387d7e16f8fded

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