Malicious PDF — malware analysis report

Static analysis result for SHA-256 563182bd8b738d99…

MALICIOUS

PDF

107.8 KB Created: 2021-09-07 11:45:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 441566667562b94e00cd2e6f0b8f28f5 SHA-1: 8d6148cc0b06c25e10dbf1ce1145a4b3d131b034 SHA-256: 563182bd8b738d99d7010ea255e2822e7145b569349b0f2567a453f9f135b171
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, suggesting a phishing or redirection scheme. No scripts were extracted, and the document body was unreadable, but the URL structure strongly indicates a malicious intent to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/16452f1a46bfa3ef3c7f0cf48e351cd4/xonupalonowerasimanazukaj.pdf In PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096acd772abd---tebezifekoz.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/603e455138967b6100d958797b36f653/37273276189.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b281f0b06eb---69577696249.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730377690ba---kokaxejatofelad.pdfIn PDF document text
    • http://wchs67.com/clients/f/fd/fd50fd9748f3592dabdfdad26f378f15/File/ragunepe.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4b3bc11ec---wizuzuzusewalejat.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/fokawexo.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2c0f5be06---68426038981.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/77307168340.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/f26c73e66c52bbfecb8b4a21a45437b1/44970478048.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/78077912935.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c030c8f0f57---11997037305.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/uk3u03hbjiu1bhuvtkok5t0fcq/zixupa.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/fabos.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210603_D780556495533F5B.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161363e5ce8cb9---wixovijebabatobutesevuxu.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-28/20210628071347962286.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/08841a4cd009ab4417283dbb472e2fbb/wuzokinazabakevadubuta.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/91d5aed7bb65bc55f731ee24fce45449/73953584572.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084a9cf91326---kosoxubogimuvuxo.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/89395885807.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210827_D683873AA17B76C5.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=leuc%C3%A9mie+my%C3%A9lo%C3%AFde+aigu%C3%AB+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_off00013628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13628 22368 bytes
SHA-256: 08adb4ea237edbb0638867d6ce4967a91f03a9637f5bdb761552d0353a3e2f82
font_01_sfnt_off00016ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EF0 11184 bytes
SHA-256: bf391a68f65feadc26de68d79d58f3ba86b43c7c8cf59cbcb683be64ef7de9c1
font_02_sfnt_off000187eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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