Malicious PDF — malware analysis report

Static analysis result for SHA-256 8efe3b2f791078f0…

MALICIOUS

PDF

69.2 KB Created: 2021-09-05 21:20:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2f773b71d35200a5ca21cf35100ef207 SHA-1: 1767c63c81c2b355ba0605d40388a7f85a39b46f SHA-256: 8efe3b2f791078f0a6b708eb1a81c5bc4b1436b639b0b20ab5fc3352f9c20761
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to other PDF files hosted on various domains, some of which appear to be compromised CMS uploads. This pattern suggests the document is used to redirect users to potentially malicious content, such as phishing pages or malware downloaders.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://pratiklinik.com/img/userfiles/files/29034060038.pdf In PDF document text
    • http://geotersrl.it/file/kiwirine.pdfIn PDF document text
    • http://euro-ex.net/images/blog//file/80980778009.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceb7145b81---jasafasexijoj.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/2f5140d3570f6a4ea041d4a2cfc5c3cf/todemu.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/9500465164.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/goxipiwolasabalaz.pdfIn PDF document text
    • https://777mto.info/contents//files/91621626535.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161196443661bc---jevunijosodibimo.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/8d3eab2e795d9ca0985215da8b3d0e90/dulukuduzeruxubufeketar.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160de26fc2ff1f---27439603312.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075944096461---3479725091.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/73722474930.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/ligcgl9j86k3l0pgmg1oos9h9i/nodusurebemidikad.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/6028203043.pdfIn PDF document text
    • http://chemicalengineers.ie/images/nasotipajowixedexaxanu.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210510/210510025257770152ffbdr0ejkhlw.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fa7080aac---zuxotipulebogaj.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/6kfr720p4ec5do6mptj1dep075/welavovi.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/tirive.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/gafatitixel.pdfIn PDF document text
    • http://kingnature.ru/files/files/63022027714.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=who+whom+whose+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_off0000afcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E3 10240 bytes
SHA-256: 8bf29fb18b6b7efa96ebe4b0fa1ef858252f35c4ddb6a999e9ac202786d2fc43
font_02_sfnt_off0000deee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEE 16368 bytes
SHA-256: fb11db701ae65907b8b6a351eb63a294e373337aa72a5317c6b228f88db965f1

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