Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce8636509257dfeb…

MALICIOUS

PDF

92.0 KB Created: 2021-09-14 00:14:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a61c7ec882b2643830083c3fd26e4268 SHA-1: 31ca3bb08d17a9da82236ac55df68177b904618d SHA-256: ce8636509257dfebce0bc5a307cec52842aa764a3f41da282eff6941139c2a61
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs and link farms indicates an attempt to redirect the user to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://cauthangdep24h.com/upload/files/zawaxexalifumowabeve.pdf In PDF document text
    • http://huerural.com/uploads/image/files/foxixe.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c5ee4d775---53605674794.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/dexukatakiguxaz.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/jaforupe.pdfIn PDF document text
    • http://edituj.cz/res/file/66566859464.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/wurabujanimaxudopo.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/5712992794.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f699c6a0da---nazuwepo.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/4d7a85cf7b62ea3f64fe228aab45706a/69122059744.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/84655820995.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/18903391795.pdfIn PDF document text
    • https://mimzyonline.com/userfiles/file/mijixomifukilunusavidowa.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/63904726902.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/96281202652.pdfIn PDF document text
    • http://ashleymongolia.mn/uploads/files/493887290.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/vajoxira.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/jefajawifezobexo.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/88321359596.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/moneritetifemoxonafira.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/gorapuforarak.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/e1592d806d63c407917a9751dd22b9fb/9156487117.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/90454105354.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/sifapbs97gjv0lpgpi9on6mrq2/tinimasisipev.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/jazemixifejapaxedakiva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=pathfinder+kingmaker+thundering+claw+of+the+bear+godPDF 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_off0000fdf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF7 19208 bytes
SHA-256: 985b5175e8056a6278fb7acf4e0180fd7cfe387c75b12d419905943da21c67e5
font_01_sfnt_off00012ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF1 11172 bytes
SHA-256: 084489660fed0e1a4b7a704992640d0dc2dbc3729599a920d26d923ebc9b581f
font_02_sfnt_off000149b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1