Malicious PDF — malware analysis report

Static analysis result for SHA-256 d16d64136cbe1345…

MALICIOUS

PDF

73.6 KB Created: 2021-09-17 13:44:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ed2c0e51418ff7fc4e557a07871ac706 SHA-1: b7a6892812fe8da993831481cb78068cccd7ec4a SHA-256: d16d64136cbe1345b699ac5c97d589ed58ebbf52eecda511c172a3a9ac573ca2
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised CMS uploads. The ML classifier also assigned a high probability of maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://icsbc.ru/fuploader/file/dozisivapunofakurowasejo.pdf In PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/luderirem.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/42681912196.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/bamijutikomig.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/12868476793.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/goliwoxawuridarefasapige.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/bemodawewaxezonizi.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/18347820136.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/24166578044.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/52119598498.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/eonjff6bdqu8bhd29mdjchn79i/gumevo.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/26714731587.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/manidinowi.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/vifebutuko.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16130c266d277e---22866356919.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/jetexanifevefutivofadiwo.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/lefetilixijibiw.pdfIn PDF document text
    • http://vandofigueiredo.com/userfiles/file///bulusififekevipetur.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/27852898328.pdfIn PDF document text
    • http://masukpt1.com/contents/files/37249855890.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/16530757479.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/vasiwasolu.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/fd184fc7a6ee9f3d5724d5798589f5bf/rosuzimipobu.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7b8f3fb11---gofiranebadeti.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/bovet.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/nelufaxamekuvew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=a+flying+jatt+full+movie+download+movierulzPDF 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_off0000ba25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA25 17132 bytes
SHA-256: fb7b7a08a6d67fcb5b27f4d6399e6e924e095c48d22d7859f4787144456c693f
font_01_sfnt_off0000e65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE71 11064 bytes
SHA-256: 43d802951bfe90bc56e1a4f316f958bb5c77aa24c82dfaa3be64d41ba67fa8a3