Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf4f601eee14eef2…

MALICIOUS

PDF

122.1 KB Created: 2021-09-08 21:32:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 58febd78d4ed732e2475e49ee09c8476 SHA-1: 0b92480b9fdc3d1494f4e6cba04b6e6c6c3d3f61 SHA-256: bf4f601eee14eef286aada5e23f1f16f9a6f22f7248ecaddf1139e9093e4bfd5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of numerous external links suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://inwebjor.ru/uplcv?utm_term=eragon+book+2+pdf PDF link annotation
    • http://dorapeyzaj.com/userfiles/file/kofemuwumebet.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/baruvafofijagalasepabefa.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613181e56384f---berexarazametelimiditavuz.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/jagopefuvova.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/24089681281.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135833df00c3---48415375472.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161318becdb571---62387316763.pdfIn PDF document text
    • http://zkpower.net/upload/files/torowugumufofuzif.pdfIn PDF document text
    • http://kaitianjinghua.cn/admin/userfiles/file/202109081703178826.pdfIn PDF document text
    • http://twsl.mingann.info/upload/ckfinder_temp/files/20210903205939.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/39620057323.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134bbc12c495---11908564017.pdfIn PDF document text
    • https://laser123.com/geektic/files/nazebemepugorokoz.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/45324605946.pdfIn PDF document text
    • http://salkim.com/userfiles/file/74989801386.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/36717371936.pdfIn PDF document text
    • https://igraonica.me/userfiles/file/raxinesizuxufipifegob.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68855116085.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/24009382903.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/64467967381.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/sufedivuzu.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/netezovigenodiwiranatun.pdfIn PDF document text
    • https://cooperadora.grupocreartel.com/documentos/archivos/pikusadazimojir.pdfIn PDF document text
    • http://hanarotalk.com/userfiles/file///fukaraxulowamoz.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/gijenep.pdfIn PDF document text
    • https://ottopianos.nl/files/20439054211.pdfIn PDF document text
    • 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_off000175dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175DC 20656 bytes
SHA-256: bf3e12b8adbe4f6f6638ee275c94fd5a9dcde5312db31950936f35f6df3c77f5
font_01_sfnt_off0001aafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AAFC 10472 bytes
SHA-256: 41bb5d4eb2429383b29129ecdc3b3a640599e9f784b3280b06de12eab15c3bc6
font_02_sfnt_off0001c270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C270 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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