Malicious PDF — malware analysis report

Static analysis result for SHA-256 9310759ae86c2daf…

MALICIOUS

PDF

70.3 KB Created: 2021-09-05 20:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 45f35cb078e5ae10ad13235be533e784 SHA-1: 7652a8fd896ec0de40715e5b1ff4b621367c2810 SHA-256: 9310759ae86c2dafdb49b8befb4ad2bcc40fc074141aa059edc3f0ec93ec2075
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it likely exploits a vulnerability or serves as a phishing lure. The document functions as a link farm, with numerous embedded URLs pointing to compromised websites, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of multiple links on disposable hosting and compromised CMS upload storage further supports a malicious intent to distribute or host harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://angeladaniel.eu/uploads/files/mumalik.pdf In PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/68625820669.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/31f32d40f53ee8c44a8592fc561d6261/77778819378.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/xufafavesezametulaxaz.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/70714ce2077df18d991991006d8db61a/xatoku.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/76860272605.pdfIn PDF document text
    • https://magerp.org/upload/files/78569234030.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/35844658271.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160897bf2ac4fb---wodadojavevo.pdfIn PDF document text
    • https://micsys.in/userfiles/file/65357985037.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/79126435682.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/81245921715.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/gobixufapujinafujiw.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/vapuzogebegewejuvo.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/ilr11f4a05k46teva88sjqk1s4/sivozetobitosigogulewik.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/31e7421a49d0325b5fbd3daf5e8bc1b8/22203322013.pdfIn PDF document text
    • http://sbsedupatti.com/sbsedupatti/userfiles/file/medoleje.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/sewidavidamepef.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/41721699422.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc0bac6fa9---kivikur.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/biwurekemazatan.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088459703327---nanadupusagovovanafukavo.pdfIn PDF document text
    • http://parcfamilyreunion.com/clients/b/b3/b3ae52aef0329bb57e848b27182677c8/File/91335145677.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=iit+jam+physics+syllabus+pdf+free+downloadPDF 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_off0000b02e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB02E 15540 bytes
SHA-256: 5560bc16e569368d12628f01fe3ee80d44d3ba89ceea14d698763a8a6c400edc
font_01_sfnt_off0000d746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD746 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5D 11404 bytes
SHA-256: 8c18a562481211cbda61b77a29c325ec4ed1b581c9b43490e7f9dc4fbedc1c67

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