Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c3142f969435118…

MALICIOUS

PDF

76.7 KB Created: 2021-09-24 12:17:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7a9cdcb7406f57949d7f96607cff708e SHA-1: af91b0a504d7b18cd1b5b52939468d4c890bbe98 SHA-256: 9c3142f969435118cab297ec017412b1c91b8f1b6bc0de6ee5cf1b990a3a726a
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farms indicates an attempt to lead the user to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://buzmakov-ua.ru/admin/ckfinder/userfiles/files/tasibo.pdf In PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614d71bfcdab8---87170024166.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/rabetadesadokepubopofoso.pdfIn PDF document text
    • https://giasidaily.com/uploads/userfiles/file/82260611698.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/puvefodijubinupobebi.pdfIn PDF document text
    • http://radiosalsa.fr/php/rs/filesupload/file/72923786140.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d24e98c703---16497550924.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/75002187384.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136de1895a17---nusesirutife.pdfIn PDF document text
    • https://yenicekentkaplicasi.com/userfiles/file/46006250586.pdfIn PDF document text
    • http://domoticasociale.it/immaginiNewsletter/file/gemexizunuvopenirunemum.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/memuf.pdfIn PDF document text
    • http://www.77ice.com/upload/files/51914140913.pdfIn PDF document text
    • http://www.abcklima.hu/data/editorfile/pitud.pdfIn PDF document text
    • http://julianina.dk/upload/file/42773865074.pdfIn PDF document text
    • http://mextro.de/upload/files/17904800131.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/xaguzanozajamaj.pdfIn PDF document text
    • http://gzmingjun.com/uploadfile/files/20210907_090931.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8aa29196daa3eb52fe4127d355e7d114/polojugajedokalovoxo.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16135dc829cbf5---7947672638.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/serugozogutexanitefipisex.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/mimabazinabobakef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=tema+launcher+apkPDF 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_off0000c953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC953 17484 bytes
SHA-256: f95c26a912e3f9cf7f99917b015c5ebbc69e1a0f0bf42dafdf77ef6bcfe1beb2
font_01_sfnt_off0000f695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF695 10316 bytes
SHA-256: f713e7cd4887e7ffac9cb77a295e6bd368c136f791e2af699bd28cf717f1e21b
font_02_sfnt_off00010d93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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