Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bf306c305621969…

MALICIOUS

PDF

71.7 KB Created: 2021-09-05 01:30:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 155fad1a8e50d4887dc0df453d48feb1 SHA-1: 12c92101a14eb298284370f217bb245a6ffaece5 SHA-256: 2bf306c305621969d0e5e0ea31bcf1cfd388745beae1274995e539773748b5c7
156 Risk Score

Malware Insights

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

The file is a PDF that contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing or trojan distribution attempt. The presence of multiple links suggests an attempt to redirect users to malicious content or download further payloads.

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://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/65c402001dbe8825d6336d4f6abe73b6/kusiwexafi.pdf In PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/2636921193.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/xonotuwisijexutimot.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/9651678fbee8f23363cccd265e39d63e/12877565137.pdfIn PDF document text
    • http://woykoff.hu/upload/file/10123937362.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f039b7a9f6---32031636079.pdfIn PDF document text
    • http://dmscsmartlifeblog.com/userfiles/files/pinamixilapiga.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/2bfrf9ar0j28vggraheu5aebn7/wugowasako.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/vuvovutoxemifiza.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c86021d3ecc---duzixusowunutakidiliku.pdfIn PDF document text
    • https://clickbox.ro/images/file/xilamugagogo.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/tekutokavikigapub.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/dd75eda6e16eb999fd38af153f3617b0/rozoronij.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c03ecc1119c---70417242745.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/31897052683.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7f78bc601---gubus.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b10c0b94052---21312495408.pdfIn PDF document text
    • http://sun-tes.ru/files/file/15817578641.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/40873215659.pdfIn PDF document text
    • http://1970lions.com/clients/5/57/57eb30a5877ba0c7834658d164206012/File/54995146499.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160795223320f7---varonuleropizufovetu.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/9c1eff8b033ee5edd18dc625d8014e4b/3908954813.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/665982064.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/zogubuzapa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=stemi+equivalent+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_off0000b606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB606 10660 bytes
SHA-256: 94872589dc1e242aa7d3e5f22542c1af262ecb3f6ac8bebfaf49c4b7cc8c2237
font_01_sfnt_off0000ce38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64A 16744 bytes
SHA-256: 0c19a608ec6cbebf437c6c3a86bb67b03918226ac8f239796d06d50055b1043d

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