Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ef562a3477b6060…

MALICIOUS

PDF

95.9 KB Created: 2021-07-03 00:35:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ef6666f4231b04c346e0c6a5e97eff4c SHA-1: 6da3de4e613c721873d1edc73463389ea59cd878 SHA-256: 9ef562a3477b60604192af8748e0c6eec37f61a453cebc71b03f2cce118c1511
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute malicious content or engage in phishing. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/641a9151af1416f192c08e9f4fdf9504/44725088923.pdf In PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/a1979b2bd5ebdcaa33ef4a2104d10bb9/11129323121.pdfIn PDF document text
    • https://amblamy.ee/upload/file/lagubiwalazagamagen.pdfIn PDF document text
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/c4a477f19262dc648b0f10dbd9a4239e/kabujinaz.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609258a0c7b3e---pupuwosotixu.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/dajogemetokevigiputopu.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f91cc7518---lobalonawabebezakasa.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160dddab4337ff---72065960169.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086dffdaae2e---5936224339.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder//userfiles/files/74831032070.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/e3df2147d51e4476f35fee3d33475f5a/rokazofulokivonu.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/67317328911.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/jowilugaruruwuwowejul.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/ff331ee7b9f3a4319524cd3c1c36aa3b/dixisiguta.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/08861dbb3a6028dd663b0309289801aa/lonezifuf.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/36a96b509ae6bbb50800b28473f2fc3b/finuzewalodirapafowobeba.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/66013473823.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083f8da08771---jobevije.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d59e0a7020---zafowapupasusasumodugele.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210603014844_eldmw2.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791b97ddaa9---mebogewudejenegagenuvidod.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/90221089931.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/187t85mp12e5e1hqgasceosqp4/98395325342.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/4r6ajo6bal18a71slljrb46quj/vejumavo.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/gugibadotafanugefozetiwuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=bible+quiz+questions+and+answers+kjvPDF 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_off0001131f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012b31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B31 17276 bytes
SHA-256: c49a51ec7eaa43b12214f504c8dec6b8be6f42e92c06cd94e05bb559bc07bf0f
font_02_sfnt_off0001582e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1582E 11112 bytes
SHA-256: 4b6c5c9a7d2a37212bccc07b24789c53200515886e3111ba0846227f3fec295a