Malicious PDF — malware analysis report

Static analysis result for SHA-256 0df9e97f41b5d471…

MALICIOUS

PDF

81.8 KB Created: 2021-09-08 03:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9c506f736f81b2996601039afa9c75c1 SHA-1: 17d91ea1c99b57569573fbc771bcbffc6559c4ce SHA-256: 0df9e97f41b5d4716de408a6e2f33c9cf74ee47a9c32bd85fe5cd30fc95c70ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various domains, many of which are hosted on compromised CMS uploads. The presence of these links suggests an attempt to direct users to phishing sites or download further malicious content. No scripts were extracted, but the PDF structure itself is used to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/37f809f1f57457c420791b5b7e70cddf/47355924601.pdf In PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/kakokosetilosafatalir.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/fovudununobenuvogam.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/8054674953.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/dejasurin.pdfIn PDF document text
    • http://hanifeugur.com/image/files/14600717271.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/7b5f1c1dc32ad2d37ddd80f2b9d66aee/82946301862.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608605318f656---ribazetopekadak.pdfIn PDF document text
    • https://berbagiangka.com/contents//files/zuvofamajok.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/0s3ktetrrn8rp7gda924j5j2ac/17076693762.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086f380b3824---petemedo.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/58671544058.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/bepakagivepewijomutagi.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7c12cae4f---47191397218.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161298896841fc---84071972415.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/susawinabuj.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/59669236084.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/zajimepedawopagidewiroje.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/29249029359.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/jomlnjd5jsk2vhnubf3p8fod0r/dulabux.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/rowuvunimajaduze.pdfIn PDF document text
    • http://thebestpearsonfamily.com/clients/e/e6/e6a49a9b6fa3fb0349b1957bd02e8b5b/File/87144563561.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/i0mgdat1qdr9hgbgk46f27vrbn/tegegapojo.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ec2812962---xojabemur.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/jejajozavifupawetej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=rsmssb+ldc+syllabus+2018+pdf+download+in+englishPDF 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_off0000cea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA7 11856 bytes
SHA-256: 036144ef2cb23f76c0bd020f231b1d1b225c4ff5aef331b20062f40a280d603a
font_01_sfnt_off0000ea99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA99 20828 bytes
SHA-256: 8cbb69f008af80665d3bc21b1195c3ac810c471075cb0f2fcb45cd2e8f8dee7e
font_02_sfnt_off0001216d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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