Malicious PDF — malware analysis report

Static analysis result for SHA-256 10dd6ac9a35a90cf…

MALICIOUS

PDF

75.7 KB Created: 2021-09-07 03:37:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 33ed6c5dc98cec5e99ffe0018fc42501 SHA-1: caf8856f043dab4c651ea581761025b425fea22a SHA-256: 10dd6ac9a35a90cf40cd3b097f6854932cde437d19d3be99af57fe2b9e57b47a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier strongly indicated maliciousness, and multiple heuristics identified the PDF as a link farm pointing to various domains, many hosted on compromised CMS uploads. While no scripts were directly extracted, the nature of link farms in PDFs often serves to redirect users to phishing sites or download further malicious content, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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://leise.ru/admin/ckfinder/userfiles/files/74383586505.pdf In PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/dc49d1e3dfdcee7084c52b1f5453d84d/zagapeko.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/b2f881a93c14e5a584265045c449316e/busakoxifonemorejiz.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16070be073da85---26711289366.pdfIn PDF document text
    • http://dgjst.com/upfile/file/12293542414.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/48678687459.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/banabalifuni.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071eb46c8647---12540772778.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/49547738583.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/489a5cbb41ee4e911d4d183b8a910779/fozawebipitonajoxel.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/ep0u4verb68qi07jeir78grauo/kavimodejisizavavuwira.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/c3mnlqnjfavuuoui897b2mp4j3/xegubaxumuxurezukalef.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/40978851392.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/87614616585.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/52977322918.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611bec6598144---81408601608.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/64168847416.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/2418032784.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135aacd17156---gibugaresimazanamuxovenip.pdfIn PDF document text
    • http://kencert.vn/uploads/image/files/kodapovusuzotanisu.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/1715f472515f82fce7fcc79bf16e3d84/80895594131.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/76035640513.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/1726378781.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=worm+gear+drawing+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_off0000c24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC24D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5F 17540 bytes
SHA-256: 39677cffd03a35e28b7e5007458e23a8937dd99c67987426ba46b1facf1e2e29
font_02_sfnt_off00010806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10806 10608 bytes
SHA-256: 5d68230ea42f0aecf5a4f4b936f79d8dbbfff45315e9c96a5ac837d67e1091a3

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