Malicious PDF — malware analysis report

Static analysis result for SHA-256 f465767c52a3c964…

MALICIOUS

PDF

83.1 KB Created: 2021-09-01 10:06:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f39d2ee6d182989d634e4018a1ee2b42 SHA-1: 6d1c2d19a44da4d2705fcedf74e172ac57bdeeef SHA-256: f465767c52a3c96498f2ce68deeabb66a98249ea4904d3835eb7db7c08721309
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of external URIs and link farm characteristics suggests an attempt to direct users to malicious content, likely for phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://aiswaryamatrimonials.com/fck_uploads/file/kinukebawi.pdf In PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098a3d31e15c---wemujeje.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/59845093828.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/zanokabelewuzezadigizoxib.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/najewidolakiku.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608823a0e7606---31368915760.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160d251e44ca5e---83980981217.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080fc71d3532---kadugejujefidiloduz.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210614172719.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/45922766abc70d11b5802a75cf3e1b85/45884826214.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081aff833e64---lisinowugup.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/2060f1206243b50d084ace6df0d8a8ce/powabivipojojogora.pdfIn PDF document text
    • http://emannsltd.com/userfiles/zifafadumazasalot.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/zofuzanebemobogegilapemov.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160cdacf45dfc6---55067369660.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/kejubud.pdfIn PDF document text
    • http://dyneco.kr/userData/board/file/21964579260.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/31743160905.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/2mtt8bssh54ih8k0115rr2p7nq/69959765090.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105df1186126---fasazumemudazif.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/72808715602.pdfIn PDF document text
    • https://kawanmto.net/contents//files/zefifuf.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/tidebobaxexabase.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=office+administrator+resumePDF 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_off0000e00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00C 17496 bytes
SHA-256: e6a8301dff81d9721fce1fefde0f1fa1a49059c110a65e97ad8ca1528d3082eb
font_01_sfnt_off00010c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001244f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244F 10716 bytes
SHA-256: 1396509a8ee513f341f624a8d4acf9c367a54a16dcc13bd0e71086ec91045a18