Malicious PDF — malware analysis report

Static analysis result for SHA-256 4afa9052f94a9add…

MALICIOUS

PDF

85.8 KB Created: 2021-09-21 00:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b23519305e7089af964ab8040c518b4e SHA-1: 6a84a5349447a929ac256177896db84dfee002e5 SHA-256: 4afa9052f94a9addde2166d49ebe2b2e5e5f1b84cfb61ba5edab87953183d2aa
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to websites that appear to be compromised CMS uploads or part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be directing users to external sites, potentially for phishing or malicious content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rixawesazos.pdf In PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145f1770e3db---37458588537.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/zudorumivirek.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/piselejodikuwisibek.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/97009062354.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/38212412157.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/40611909729.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/fovejamekemoxizakujorojo.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/zitapulagejefojupimexige.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/nidafulitakelozovoranimit.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/lijozi.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/7656650187.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/wogazalaludufe.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210919202152813.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210910093622.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/17c800e7db2302dde776b6479beee771/wokibabasaro.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/24527987771.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/13430684343.pdfIn PDF document text
    • http://olympusflights.com/files/files/39983828616.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/rexuledolizulunibo.pdfIn PDF document text
    • https://ismart99.net/upload/files/45170351493.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/60462539527.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/nodekakogo.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/tetebefijaj.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/351df24e44e00a24cd37d96da63cc21a/guwamebizegirafufubolira.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/58917877973.pdfIn PDF document text
    • http://rotarylaspalmas.org/documentos/file/17220486672.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=tutuapp+ios+14+free+downloadPDF 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_off0000e94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94B 10768 bytes
SHA-256: 6b9c5b620b0e036756ffea34f4a7dca7de8226b6f10e140f600a611dd534140e
font_01_sfnt_off0001025d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6F 17656 bytes
SHA-256: 6737fa8c5524aff76537723d63a6284765a726b524e2f9e25d0817550d6bfcfb

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