Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfc8539a7c8428f7…

MALICIOUS

PDF

81.2 KB Created: 2021-09-18 18:13:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4b05c1704b47de6c3c37fadcd8a59951 SHA-1: 6ea1f1367dd1f1eb54db57b88317f04b5ad45ece SHA-256: bfc8539a7c8428f72d3d827dcec6a43a21bac8506893e8da4f05f5281ab97556
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed for phishing or malware distribution. The presence of external URIs and the ML classifier output further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://cructi.ru/uplcv?utm_term=dream+league+score+2020+mod+apk PDF link annotation
    • https://ladymamashop.com/uploads/files/202109100900447344.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/pebesidomogigapod.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/lisubegobutikogemunuvutod.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1613d956033961---dunasimij.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/vukewogokodufijabu.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/lunerezitubazozil.pdfIn PDF document text
    • http://itcbeautytrainingschool.com/userfiles/file/kigira.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/cmsk9e4qqugillfvdr3b3h8pe6/66661863147.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/40626802502.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/99666370944.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/nelunomodiminur.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/mimutojebisivijobisekir.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/dfedfc48aedc6fcc88a1389623f30fc4/mibanojejolagadujudagusat.pdfIn PDF document text
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/lakefererakupekonolileror.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/nisefuterawisotu.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/21169656524.pdfIn PDF document text
    • http://wdnederland.nl/file/jologobolamosozadekuraf.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/64380543834.pdfIn PDF document text
    • http://vuason.vn/upload/files/52276525756.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/modufefilunote.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/vafabelax.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/lafebanulokigezufovoj.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/zefikezowudife.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/wasinoxanaputan.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/a4bd6eedcf22f54a282a638e465ded46/gibebesixajap.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/19449798236.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_off0000d937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD937 17060 bytes
SHA-256: 40ca5cd3977be8068238c13071ba8c4043af6043be71c7b466b7e6137b64fa24
font_01_sfnt_off00010575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10575 11000 bytes
SHA-256: b3e2755e75436cf85603b2422e28c92f0d0e87d4780b9f29b8eef908cf06de62
font_02_sfnt_off00011ee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1