Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9e1296724be7d9e…

MALICIOUS

PDF

92.9 KB Created: 2021-09-02 03:22:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 299bff905d3a6aedf9c662c6708a96b1 SHA-1: 726bf05b4960d4f87e47745159f42158178cc561 SHA-256: f9e1296724be7d9e7a0688d835ba8e03eda3ff5f18a12b07ffcdb23708837217
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://ingmarcofaedi.com/userfiles/files/sutaginumojizas.pdf In PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/b7ce85e6de2f55bc9ca8e8bf27ad31fc/viravepo.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/8a3e75044bfadb92dc60d7b938250f26/mufefa.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/kisiju.pdfIn PDF document text
    • http://nensi.si/upload/file/63359947048.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/df647b84275a50623f3b59d9e007417c/zonomidadufivazat.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021073107035470554.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/4d4rpt0d84bilvl3uh6nqnl0e7/puvobola.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/meravulemutuw.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/64565326228.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/wefupomoferuvifeloraxori.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/2idqnu9frf4o5lhbcv0l4m0b00/naxopigalufem.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/14787747551.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ee32f383f---7391959648.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/16a893289376a8ccb99de15ecd795afd/rinaz.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/vf66v2as299jsu79lsvvq2j2tj/sekakovale.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b43afa35bfc---37060969062.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/naxeke.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/66nj075mb6njukinmbrb5q5dea/84468117380.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210623010117.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/xatelovebazi.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/91893921100.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f66770cfd4a---dizisibabelol.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/23e615db35616ea04248cf32d5dcfa82/80505865700.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=regulator+boats+for+sale+by+ownerPDF link annotation
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/teziwip.pdfIn PDF document text
    • 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_off000102fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B14 10780 bytes
SHA-256: df20eff0c4325b5f091300e1d522f6b052d0fc2c57a659dcb56830eae2c6313d
font_02_sfnt_off00013431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13431 18756 bytes
SHA-256: 5938058fc88b1786d192793c1ae080fa70ce56297c7ee602a19047aa2fba7ab6

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