Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d4cf62c0713d07b…

MALICIOUS

PDF

84.6 KB Created: 2021-09-11 11:20:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ff8328d2bc9a699ddc15e176fefe61d0 SHA-1: 366cd09aa13bed724a2ce1e3824de22651c0042b SHA-256: 1d4cf62c0713d07b52c49e47c07d9b5d5d63b10991578f429dc34335f87553fc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs and is identified as a link farm, with several pointing to compromised CMS uploads. The presence of embedded JavaScript, flagged by heuristics, suggests potential for malicious scripting. ClamAV detection and ML classification further support its malicious nature, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=cs3+serial+key PDF link annotation
    • http://daindnc.com/fckeditor/userfiles/file/41997501646.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302d6f2587f---kilutufojibogefulabedonok.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c54c4e1d08---13190107720.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/doxizo.pdfIn PDF document text
    • http://abnicum.ru/files/file/ruzidejorazigepasela.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/51380313642.pdfIn PDF document text
    • http://fpempresa.cen.es/userfiles/files/gerevofuxibaribu.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/xijoja.pdfIn PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/vixirazuzifefuv.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/wemomuxovifowawofoxo.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/tinuworidaxowuwepe.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/e0fb9e68fe621fb8e210158db5f5b07c/mufodapesawewumiwowixu.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/8085549542.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/nimogiduxagaxugesifo.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/62716470915.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/raviwugum.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/rurapavesevonubew.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/ponamaxozekixo.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/43454259766.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/jefurevinakivusulurusid.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/79179017647.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/2918299549.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/93031632960.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_off0000e1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AF 19896 bytes
SHA-256: 083169eb37d4a8ee4c99e29c6e1206aa23db3f63c7d67af879068ed5e292e0b0
font_01_sfnt_off0001161f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1161F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E36 10188 bytes
SHA-256: 40d20a7481002e4c03adf408b69061a0fee597511c60bc9508898ca3730caa12

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