Malicious PDF — malware analysis report

Static analysis result for SHA-256 51141f9b1550da15…

MALICIOUS

PDF

95.4 KB Created: 2021-07-08 20:25:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 67a54262b79c5b2f3285b3a5ed52a712 SHA-1: 06f9eb5051e1aad9497e00871fbc281c1ebf63da SHA-256: 51141f9b1550da15a0e0807486235f40fdf6f27eeeee07d13b35372dc42e32a1
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to obscure the ultimate destination. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification strongly suggest malicious intent. The presence of multiple external URIs and a link farm points towards an attempt to lure users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b34bc6ae416---dunukuk.pdf In PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/s2gmi330idt54q3v3jprs65k49/zodalosutujufiwag.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607106a76159e---nesafokisoged.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16082ce9b14570---kelikovavup.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736e7150993---31437961078.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a2932f5d883---selimejubesobajuliba.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/77369553624.pdfIn PDF document text
    • https://flyags.com/editorResources/file///botenidabepag.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/dogituturipafukeruruleri.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/faruz.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/7fa6966c50239825f72f89a5a5f1462f/vugawilumoxub.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160944d6a66fd2---6578912440.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/883953dc4880415e3dc001abf422a04a/filidixibodeguzalal.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609743687e542---kezatopufajur.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/19931753385.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/91b13c1d2517f5098e8d833dba79583d/nurilokulexibis.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/tofimemujuna.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad09caa62e---wimaxiwekepojuni.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/6a40edb6efe03342d4056be5ab085c61/60464906586.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16083651e3dd75---laluzopazapon.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/bebuzoxaset.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/d0c1f072bffe6060d469804b36a8ae2f/28000602414.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/c89b0c3b7bf21e28364798be5e2e6e5a/japudojafifixolabukajoxiz.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/filot.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778f41a2fea---57436213121.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/rolilipetifup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=bank+of+credit+and+commerce+international+scandal+pdfPDF 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_off00010d74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D74 18592 bytes
SHA-256: 9f332f5ab06ed3f3d4595bc44029dd72545a4d023bb614674c9a29b3d7faef7e
font_01_sfnt_off00013e69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E69 10928 bytes
SHA-256: a99b425b105d1d97f3cd3ae840c2545ec1ae1e267d216639c4564ac8487531b8
font_02_sfnt_off000157c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1