Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1f9c4e58a076286…

MALICIOUS

PDF

82.6 KB Created: 2021-09-10 23:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 96d5828db1cbce20d94980d28b9e1bc5 SHA-1: a617ececdb199f9e8b4057e555112ae1e169e621 SHA-256: c1f9c4e58a07628603e08ba89f0539cf8fcfab6b9157b64c30b6f9ee5dad4e44
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that form a link farm, directing users to various domains, some of which are hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and a link farm strategy points towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://drafthe.ru/uplcv?utm_term=earth+%26+moon+in+hd+gyro+3d+pro+parallax+wallpaper+apk PDF link annotation
    • https://radekslodkiewicz.pl/files/file/nomuladilotoberodo.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210902163056150952.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/xedepibev.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/11796259721.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/zoragovufodilokimuz.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/411361540.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/84207037422.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/79122567482.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/82153116400.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/24728038302.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/4708731101.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9450cb231---jewezebox.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161368757989d7---nogizubibimufebetomib.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/1835792333.pdfIn PDF document text
    • http://one9five.com/userfiles/files/pilemeverolowebipo.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/xanavupiforatavaderagitu.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376e86f37f1---13595037189.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/93767443036.pdfIn PDF document text
    • http://hitelesen.com/userfiles/file/jowofazafekagamilemad.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/gesulepitoni.pdfIn PDF document text
    • http://elma1.ru/!upload/files/futozefovejukowosel.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/zonubizosepiwivas.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0fc3eba6e---71358793725.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/jadunevarabewipununafuno.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/nivesezinenosafoneruj.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/vujekefokejadagerewop.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_off0000e3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B7 17020 bytes
SHA-256: 41d7e7d0e25209e1ce7b39cf3c0aa1388fc2d64514ac803b4e42f0c73d91c34e
font_01_sfnt_off0001104e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104E 9520 bytes
SHA-256: 2a554bed1950cba7ec3745639115f4c748f3fc6def6d37055f2ee7f9643964c3
font_02_sfnt_off000124d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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