Malicious PDF — malware analysis report

Static analysis result for SHA-256 67158c58ef7694f7…

MALICIOUS

PDF

77.1 KB Created: 2021-09-03 18:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6bb67b117d72a4690cc5fe3ca4daacf8 SHA-1: b9fb71588eac0928c1be1f06cebbdf6a765ae80d SHA-256: 67158c58ef7694f7e4779ead794c47b3d2c52691920d71ff80d4ff870791ad5e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, specifically targeting file upload functionalities. These links likely serve as a distribution point for further malicious content, as indicated by the ClamAV detection of 'Pdf.Phishing.Trojan'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were directly extracted, the PDF structure and link farm suggest an attempt to redirect users to malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a142211bdc4---towiz.pdf In PDF document text
    • http://boilerservis.ru/uploads/files/siren.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d2e4af078fb---30021898423.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/sakixebosatux.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160fb8da51b567---93309035969.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/tatulemuwuwerabumum.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/32794255425.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/80038815017.pdfIn PDF document text
    • https://fultoys.com/userfiles/48705035457.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/pizofokavifon.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/tidadegebipibatururanada.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///kojodisazate.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/90872984615.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e3b73bcf8---jowazijimogir.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/62742460524.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/ab65tbdesm10rg80rr41qufu8t/gewikoninumamulida.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/794e96f0991570cfcab0045132f62332/vunitiligiturolopiwavoda.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1611be9eea6ec2---26980628025.pdfIn PDF document text
    • https://topupdana.com/contents/files/bilunina.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/s2rvo0e8adgmqa4j47scah95r1/gusawapivere.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111978bb761a---50590789476.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/10241313882.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160caa5f774e8e---gijalamatesotidologawik.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/265edcd62c04a6a0d806c50c4581b36b/17187404006.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=haematology+books+pdf+free+downloadPDF 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_off0000c9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D0 15968 bytes
SHA-256: 75404603a10b79b1b96e24bef09837ccb0954d79f5998bdf2ab288c146a2115b
font_02_sfnt_off00010a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9F 11172 bytes
SHA-256: eaeac3edfdc2d493bb2a8925136bf433c23f84909a94ede261c5ce90412cfe3f

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