Malicious PDF — malware analysis report

Static analysis result for SHA-256 d164137265441446…

MALICIOUS

PDF

112.5 KB Created: 2021-08-23 23:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8cfdf509de6d121bc3b3bba1c2e8f0c8 SHA-1: 89e77afb8bbe4858e53a8e88ebcd0a96c5d6c903 SHA-256: d1641372654414466fa334c9099d8beab15dc5442998ff849199071091a8a183
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs pointing to potentially compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://allytemp.ru/uplcv?utm_term=the+view+emmy PDF link annotation
    • http://brilliantsolarpaneling.com/userfiles/file/wezorupemekut.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16073d0b1bc14e---dasumubemak.pdfIn PDF document text
    • https://bursac.net/userfiles/file/gitubawog.pdfIn PDF document text
    • https://banghenails.com/upload/file/67177893499.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/q3uaftiqn2of0ng3fga7uc9kp6/tululepogejenera.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c905f081dec---wulizikorisobaw.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/b7cf14a28e6542f5efcf893560e962fb/9043364711.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/76859076077.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/12108509729.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/43412467310.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/88230801836.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/xilalijivarafudupud.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/270f3f2e59a93b9b5281428933ea8926/kitilozo.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/letobevigamalakisudumuwev.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/44863345a62d8f88d34e3c62d68d69e8/jufug.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/23669430610.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160741c57e19b6---52930042209.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1625703176.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1606c76eaabcc1---fivisego.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff13248c1d---sazuforagofaj.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/0f557b8450af1c9ed98ea634ba5ed912/felivadelew.pdfIn PDF document text
    • http://novichiha.ru/pic/file/juwupoxorawip.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/617100594.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/5166ed395f7997a51b6063c028f5605c/numise.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_off0001536d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1536D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016b83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B83 9804 bytes
SHA-256: 3599d59122d31b9a01f7a21564c608c96fea36d2219a5bb64f38f38e162339ac
font_02_sfnt_off000180fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180FD 18416 bytes
SHA-256: dd690dde1056969c8d5758bfd2e51e178c8befd0c7bf53605e73a8bf99885cfc

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