Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdbf9c71942b57a6…

MALICIOUS

PDF

81.0 KB Created: 2021-09-16 22:33:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: eb39edc7573067c629a958c45dc46d9d SHA-1: 2741ffa8b4f4798679f3e6f0bee7ff10ea1b9ed7 SHA-256: fdbf9c71942b57a67b9a3f01d8974a21bb69c0d3b82a979dba01b299bcb628b9
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS platforms or disposable hosting. The primary purpose appears to be redirecting users to potentially malicious content, leveraging SEO tactics to increase visibility.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://granitabrasive.com/editor_up/94531069008.pdf In PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/28444298700.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/bibukefa.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210916062917.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416180797e5---94199301332.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/nosugiwubowolezivigafate.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16134feef787a1---tujeragawosixedu.pdfIn PDF document text
    • https://tarsiman.ee/files/file/repupiwer.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/86220497515.pdfIn PDF document text
    • http://lyzph.com/userfiles/file/Fl202109080057248561.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16141c55594e9a---98718592152.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/10756310809.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/vimatu.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/fudanibusobivo.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/warenewozonuvetipobi.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/mamesufojo.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/41273189584.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/22429246968.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/vigizorabadobulim.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/31124312936.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/8124914576.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf9aa2d608---fabujorudu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=increase+instagram+followers+and+likes+appPDF 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_off0000d8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CD 16880 bytes
SHA-256: 32f3823efb30fd2d2a7e8dd6d1cda4345cca5c85e8ce28712e7a01af9de4a7c7
font_01_sfnt_off000104c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C3 11092 bytes
SHA-256: 9b50fdb3ea8905d788afbb8d22ad0397d36baf34d5ca4d621a303debf99d0acd
font_02_sfnt_off00011e7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1