Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf9a35f2fc13adae…

MALICIOUS

PDF

81.1 KB Created: 2021-08-13 02:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: c234957f47a6f09e5f107011f157240e SHA-1: f15c34b7587549674f80e8e3b669838f1b9ff8fc SHA-256: bf9a35f2fc13adae68c6fadd3d98cce63b0997ef1a1f7c2df3e09c522b189934
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier strongly indicates malicious intent. While no scripts were extracted, the heuristic firings and URL analysis point to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://edu-mate.kr/_UploadFile/Images/file/96300786890.pdf In PDF document text
    • http://mawaevents.com/uploads/file/kodutopesefawevuxetemas.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/17299475152.pdfIn PDF document text
    • http://suapaiatuipelehakefamily.com/clients/80707/File/89160647101.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/75720826750.pdfIn PDF document text
    • http://www.polni.si/Images/files/giral.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/figeg.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/ruvemedilusiwix.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/20909942437.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/355cf2d74dbaae267463be1b5487f611/67623457120.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/2cbc71122834b3911c5427ff1bf6ffb0/48069266809.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a286cbcbd59---30817756382.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/32932564933.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2baedec7bc---manojetovubovagojurelaror.pdfIn PDF document text
    • https://tonitomov.com/picture/file/saziz.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/65730107180.pdfIn PDF document text
    • https://bursac.net/userfiles/file/bomelevuvukasafinafi.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/93601085903.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/f972cb61e1585f284ca736e3c58d6eaa/wikapetuj.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/hgupj75e4q9ht2pcq5lteu5btq/fumulelogijolenikuzu.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/73049605743.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9954f93510---jukobufonatotifusesudanu.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e564dafbb---68967014557.pdfIn PDF document text
    • http://ekotronic.eu/files/file/momuxi.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/70395514431.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/77346616313.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=tecnicas+de+balance+muscular+daniels+descargar+pdf+gratisPDF 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_off0000d68b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9D 17768 bytes
SHA-256: 9fb981b494e2f28010b0a58ee7f91708c7dac95f30be6947fa57d295f6fc4ed3
font_02_sfnt_off00011bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF2 11044 bytes
SHA-256: 7561c8ca6f419e19073cee7d40585340c32cfef3e633beb633c1cac6072c9a12

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