Malicious PDF — malware analysis report

Static analysis result for SHA-256 e741f858d8ebccbf…

MALICIOUS

PDF

84.3 KB Created: 2021-09-16 22:19:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9394ffec7e227f7fffa1746a61ba9eb5 SHA-1: 41d2a0a2678100d3dadd44e0d521fd407039a4b9 SHA-256: e741f858d8ebccbfb781806fb66b5b69e428498236ff1d1b5e80b220b340055a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as a malicious PDF by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to link farms designed to redirect users, with some links hosted on compromised CMS upload directories. The primary attack pattern involves luring users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://infrive.ru/uplcv?utm_term=star+wars+ultimate+alien+anthology+pdf PDF link annotation
    • https://krainaogrodow.eu/zdjecia/fck/file/jisojeganosunu.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/dejetulilitipejulu.pdfIn PDF document text
    • https://melz-feu.ru/upload/sinilowitorefan.pdfIn PDF document text
    • http://slovoveri.org/userfiles/41478667461.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/susoxifuvovalu.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/87786529157.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/71115458524.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/84409462847.pdfIn PDF document text
    • http://quiltingacademy.net/fckeditor/userfiles/file/14150231317.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/b77df6898dcfa7113bf350fb51f229f5.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c1d7c8aad---zifalosipate.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a234c9247---29106115754.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161429472c2131---96328343351.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/febavike.pdfIn PDF document text
    • http://sxsasa.org/images_fck/file/1631571932.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/161406f5aa8e70---sugumad.pdfIn PDF document text
    • https://cardolf.ro/files/21614116978.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/gaxivesifonulabuwaxebapal.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/sebolatosudilefanutave.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/pepolirepiperajulojuvuju.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/50499805992.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/sugab.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/90861951854.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/70057390813.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/zuluvisuzimaxidonagexes.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_off0000e05c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF873 11320 bytes
SHA-256: 9bbca37637562f5bda75e7f35cf22cab77ff7b490a3a55fa527daed48229f76a
font_02_sfnt_off000112b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B3 18712 bytes
SHA-256: 1b0b69be244e175ffc92f14a1eed8da49c0647734d52bd05510b173a42f69f1d

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