Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2a1a49da246aa66…

MALICIOUS

PDF

74.7 KB Created: 2021-09-23 23:12:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3300a9fc68e628bd14411e0ac5c3999b SHA-1: 6974fc3f1ef435f46d390059dc4edd9ec4964ca4 SHA-256: d2a1a49da246aa66a99a5fb1dc1ccbbcf53de4dc5bb30d9eb29bf7cfcabfe387
156 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of numerous unknown URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirm the pattern of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/72189421472.pdf In PDF document text
    • http://cosyromania.com/media/file/82170319937.pdfIn PDF document text
    • http://apex-architect.ru/images/file/72018421526.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/zupuvujuledosapitunoxeke.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/tozifesuzigejotujuganina.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/nirimejukotokuba.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/55990498415.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/linefuwomus.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/71517581203.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae7573b620---vewaramaxevozuromow.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/cn1v520qvd44p5o4urf2qjn2me/xisifajovikinowoxex.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/pesofefobikorej.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/fewutewopilo.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614637fcca088---walijituzul.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/82227809054.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417e180a79f---46368075658.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/63653940274.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/53534497545.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/97048342090.pdfIn PDF document text
    • https://discovery99.com/userfiles/file/tukemofefot.pdfIn PDF document text
    • http://webminmax.com/userfiles/file/96054362495.pdfIn PDF document text
    • https://path.mn/userfiles/files/24440020570.pdfIn PDF document text
    • https://riolisboa.com/images/ul_files/file/R9E3bvXKApZ1.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135501f0af70---vovux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=blocked+number+still+texting+me+androidPDF 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_off0000be47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE47 11200 bytes
SHA-256: abbabe7fd2551f95578158aba3c2b5729adb4ebd300f74f0107ed44db31e7f2e
font_01_sfnt_off0000d84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84A 17584 bytes
SHA-256: 69550bba37687cdd7a0bed6d382ee3dc2612b642a834f61468eec978e2787478
font_02_sfnt_off0001052b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1