Malicious PDF — malware analysis report

Static analysis result for SHA-256 80865e01fbffea21…

MALICIOUS

PDF

72.2 KB Created: 2021-09-24 16:19:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d41e9bc3a161406207e6c54ff1036b2b SHA-1: b79170cb8279e48657529780e1c476d24edd2d35 SHA-256: 80865e01fbffea21f778690c1fa5f58d4e689ff9c65c7f0f4f8b1abdcb78860a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farms hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the document is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://queure.ru/uplcv?utm_term=mobile+screen+to+pc+via+usb PDF link annotation
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4c1fbc93e---33750290172.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/15725059897.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/fufejonisadajo.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/7d4d96ad8bf0eefe8d77686ac9b18efe/xudavimimom.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/lulavoja.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/40950714443.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/jujikinit.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/posuzuxesuxome.pdfIn PDF document text
    • https://pcetravel.com/files/file/82656716734.pdfIn PDF document text
    • http://msiutilities.biz/documents/47266933735.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/josugofunorojuvixer.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210918061037.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/pinovededevepixaduwu.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/jewekosetuxu.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/96031059756.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/wepokutusudugeluxaroxobiw.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/nabelomadolabuwisapaxekuw.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/426a20701833ea14c9e5bb6e3a66d9ae/mogutadopewalipofi.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/63620321694.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/53363237550.pdfIn PDF document text
    • http://woodwaysindia.com/uploads/ralopinupa.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/44j1ijg95g4hd9cignuhle465s/xonefure.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/vavatozilibewive.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_off0000b628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB628 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3F 10664 bytes
SHA-256: 6817ce6e3b09aa220dd11ce2417a07fa2ea3e6c208872ee2232058a4ff3ea436
font_02_sfnt_off0000e6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A4 17448 bytes
SHA-256: ed176cf7223a20911daca2d099882da63d36cfecef27ff9edd07f06ad1931884

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