Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f7055de9fee2b67…

MALICIOUS

PDF

72.2 KB Created: 2021-09-29 12:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cc7947a8090b0948f8a4870b4bc4ee1c SHA-1: 8f09b013a4471ebf66a569ef63c9a1396210dc8c SHA-256: 9f7055de9fee2b67635c6acd723d141cb75c8ac975ae8755e47a807e3e95dda8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites, suggesting an attempt to host or distribute malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425379a3733---49254740239.pdf In PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad3c9ccf77---burifumol.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/81398818052.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///vopisijeleruk.pdfIn PDF document text
    • https://mbp.hastatis.com/mbp/upload/images/images/upload/ckfinder/52337010724.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f301434310---98413664230.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/disib.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/82901758984.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149bb05c4321---gitekokudajesajibegigu.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/161468d3314585---51851535797.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb4bd3e0eb---53677487084.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/watirisi.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/oihsngtejoir14qi5nn5b0im8r/petajodejunuxomimetuvewo.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/kodibarovip.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/9egm5skadtjpjevjgaqgj13j2d/bofodaseg.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/letuxeligemurad.pdfIn PDF document text
    • https://dampinggame.com/calisma2/files/uploads/64022218597.pdfIn PDF document text
    • http://flapboxes.custompackageboxes.com/userfiles/files/xaliriwanorarele.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/4959684865.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161343ac23f8ac---wapovonazevam.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/43575913918.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/83963378510.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210906110912.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/ramiwije.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=critical+strike+cs+counter+terrorist+online+fps+mod+apkPDF 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_off0000b4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4EF 17416 bytes
SHA-256: a361fd479e212a42294fe28d890d3f6ab739b7216f3ea8d1cd4093ee1ecc57e1
font_01_sfnt_off0000e15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15E 11004 bytes
SHA-256: 02cbbd26e05267f31c5c9d27527f80f488d7a81f229ff486f364b629c3397908
font_02_sfnt_off0000faf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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