Malicious PDF — malware analysis report

Static analysis result for SHA-256 61a434e5b8b6668d…

MALICIOUS

PDF

414.3 KB Created: 2021-07-05 13:43:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c33c20f46550be1ad340d6e072e6d5df SHA-1: f44ae9c9c4647d221cd3f2172f58fa32400f2457 SHA-256: 61a434e5b8b6668d7c2fe93175f20dd7f6ef1d760029eeefaf781da57fb2be26
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, many pointing to compromised CMS upload storage, suggesting it's part of a phishing or malware distribution campaign. The presence of embedded URLs and the PDF structure strongly suggest it's designed to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7540

Heuristics 5

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=applied+channel+theory+in+chinese+medicine+pdf+download PDF link annotation
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/87304980414.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/d5a505da0b55f9ebfc7db5eb286e99a1/47789698776.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160be33c4c068d---lunetoletifumupafigudu.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/qjlg970eucgv7gtn013ancu522/95589769152.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1605757a6e---leremimosuvuz.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d142c37e93---51170460616.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608372f6b96f4---47800092162.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/94578644681.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/dudagepipijitejagasa.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6fddf0327---fojepokuk.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/35680863566.pdfIn PDF document text
    • http://twilaw.com/files/files/ropotixun.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c87a8ac58e---jifutuzuregokifilolof.pdfIn PDF document text
    • http://brunsfamilyreunion.org/clients/e/e7/e70b0594429ddd28dfd4dd2f61c76e80/File/jopaleremawivomogubaxeke.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/5ra4bd54cffm90a3q2hbc4v5sp/32263401894.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/3608187339.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/953f918a4f8942d6a3d63b19221240b3/34812309380.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/8n9gumps03hh3tegfvlb8rt4t5/filivo.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba22a2c10b---88309948002.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a35a2481d8b---63809181930.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/wiwurozosed.pdfIn PDF document text
    • https://kede.org/userfiles/file/setuwex.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160dedab9ae65a---wemixugor.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_off000600fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x600FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00061912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61912 11068 bytes
SHA-256: 034f502624f9dfb142f642aba513dd23bb1d98e18f167e400c51c7eaafd43b13
font_02_sfnt_off000632bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x632BC 19628 bytes
SHA-256: 7a4dbd1e53b4b14fa74309d296c6c86e27726a9628e227f16b1663408362f1e9