Malicious PDF — malware analysis report

Static analysis result for SHA-256 64c4021509cad8bf…

MALICIOUS

PDF

74.9 KB Created: 2021-09-14 08:05:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ce8210d9d3385a418792c7bed7048401 SHA-1: aee0db97c235a1b3fc61d35332be04a1d1ab94c3 SHA-256: 64c4021509cad8bfdfd48da7c4879e47e934b5a681ba6c1f3b7c4e4df5697bc1
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, characteristic of a link farm used for phishing or malware distribution. The PDF structure and the presence of link farms suggest a tactic to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/koguzapaziwumevidokifo.pdf In PDF document text
    • http://augustaelectricalwork.com/editorData/file/93331065000.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/57245716443.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/rewokogujidat.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/simojesepanagowig.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/16733447118.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c18b08e9ff---59721215520.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/fadojixanifilenamo.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/54505272671.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/puvuvumewiwifak.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/66270464685.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/luxanedetoninoledi.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/65291764303.pdfIn PDF document text
    • https://mmszke.hu/files/file/rotiledokoxi.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613b76c73e650---89881857792.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/zutojuletixu.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/59014915661.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/weginijelerokukatarajogu.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/ravanu.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613804c992823---vapojate.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/28815212996.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/8170491921.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/030502008010.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1613cbf795b460---nijerajudutanibexovu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=facebook+lite+mp3PDF 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_off0000c263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC263 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA75 16896 bytes
SHA-256: 5f1d6e810f034b5d378e894a7b2562b609a104207e28824ff96f754573dad6c6
font_02_sfnt_off00010626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10626 10544 bytes
SHA-256: 2878a5fff46549f6f68b61e6cebab7ab3043d38ebe80c15adbb58e35bc66f064

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