Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e68bdc48778ad8e…

MALICIOUS

PDF

115.9 KB Created: 2021-07-24 21:14:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 80a9b84c04561a211f6e61670ba7be7f SHA-1: 795bcfa08ff8e88873c21f55ff0c306e02c43d2a SHA-256: 9e68bdc48778ad8eb89f4669bd32dc993c0e52105543802e756a9ac8f602ecde
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The document body is unreadable, but the presence of multiple external URIs and link farm indicators strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9863

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://iwilldoit.ru/uploads/files/files/37382432518.pdf In PDF document text
    • http://pkynfe.net/userfiles/file/jexikikigused.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1085234bd---lujiwepofelifibeli.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/9056glom1qr3u0fosfl8j498jc/12497220916.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf4698199d---lozekolagesulariparu.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/78575699885.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/29624009893.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080db6e62b2f---19661483049.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bae3763440b---melunixosudulimomipat.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/d3027cbe0fc80388c298929f0461ecca/55684465359.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/46192453636.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/049743db73ac3f2ef65abc2031d2045c/nimal.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/34rps0gnsjcr04mrj76u1qchj7/zuzidobisidifegekevufu.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/miruwa.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/69257f5b91da12d06dee5f7748417909/gipusokomewomuj.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/cb998b443bbb3ec9c83bb66eebce757b/ferufovevusufafupale.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/pekewipamuged.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ad15fcebb2c---64178258273.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/pc528nqe48ratedge6oe17jbkf/tidaxaragexegajelijatov.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/nonebojudebun.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/12972359059.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/5e33847542e3f08eead20c1170d5396d/ketebimogutawozafuro.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/1f6a1213279b9c1daf97e8edc9b6455a/gekikugusipenigogaren.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160a84d6eb4db7---10025317691.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/xotova.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c09d9b4132---22731840801.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=los+or%C3%ADgenes+de+la+civilizaci%C3%B3n+gordon+childe+resumen+por+cap%C3%ADtulosPDF 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_off00015cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CB0 11344 bytes
SHA-256: c5d2389eef31c747663d48fb7641c269022d3dbdaacf4cc14718e09bc5d53adf
font_01_sfnt_off000176bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18ECD 18144 bytes
SHA-256: ef033865dab4450530fe2d5d7b6b69b3d98e3036b4efaa552022a5d60a17b21e