Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef6b8814dded469c…

MALICIOUS

PDF

93.1 KB Created: 2021-07-23 20:28:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d93626e869374b737e44a7d28f2161b8 SHA-1: 4f02a3adc521d3578140e19719975e1716518135 SHA-256: ef6b8814dded469c344c073c94f04f8a237653c1ece46ffcb01798981df1a60d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting or potentially compromised WordPress sites, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' reinforces this, indicating the PDF is used to direct users to external, untrustworthy resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://scandirent-new.ru/uploads/assets/file/bekizudeminudorugejok.pdf In PDF document text
    • http://fly.no1-yes.com/userfiles/file/jalutetuxemasol.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/14269235323.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/df84470e9d92364144b80aeccaaf9912/38213045960.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/rukajizidoxonamemulaka.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/9sm5bn46badg3cn714utbp59an/batotimixol.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcaa3d3ccd---bunoweluxagev.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9004cff0e---xalefuwarupunewesanurinov.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/0u7drqa7gcnsg0mf6rmk40t0gm/92011826745.pdfIn PDF document text
    • http://apvn.info/userfiles/file/98058058281.pdfIn PDF document text
    • http://normel.org/files/upload/file/88671361357.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/5ijqbqr1m1inqumgor6smeh5e4/fisowededug.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/nafedixaxox.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090610151985---vojon.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/25386032321.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5de9b25fa---viwawajude.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/82076308722.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/ni58h9233q0ng1td7jjs6uctvr/wurapefolijagoloxapaguw.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/72815415676.pdfIn PDF document text
    • https://keongracun.org/contents//files/feradiwofuxadej.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/64788fce172ac98a1e818f5749f2b8f7/zalagujes.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/18005069987.pdfIn PDF document text
    • https://ecohort.com/userfiles/files/49043770725.pdfIn PDF document text
    • https://mmszke.hu/files/file/16655090640.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f202c26e14---kokobiwebexonofa.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/f0390ee859fd5cf845619778527f3e88/xawexe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=bridgerton+books+set+in+orderPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/93613ea37aece1c0741118ace001d135/zifenawukugamale.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_off0001054d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5F 18504 bytes
SHA-256: 724646c873421eeefa7113d9c469e25a1ae77c9f1d84d2e517b36792e5794266
font_02_sfnt_off00014e37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E37 10500 bytes
SHA-256: 73b0261bec13d38b7fd4b8ff1340612dc0f2ac44ee28aceabf935a45c9fa1280

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