Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7fdc84f4bd90ab9…

MALICIOUS

PDF

76.7 KB Created: 2021-09-14 05:03:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 11e1c81b4b84ef3ef1f34274ef707bf8 SHA-1: bed8171c0f3f0286d4ec90d1aec5843e71ffe301 SHA-256: d7fdc84f4bd90ab9fb7eb8d2b63fb2b4d879292e1405f27f4b0ec96ca4e446f5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. Heuristics indicate it functions as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 7

  • 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.
  • 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 http://regalmotors-jp.com/js/upload/files/nibosamapilufapudukevofav.pdf In PDF document text
    • http://permagnet.com/upload_files/file/210906042905496763tzkvkw.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/95538606018.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/wuzako.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/bofawesesirumaja.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/30408184194.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/rr0psafhs2ji218ha338f4foei/selazebitevejeweber.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/26830990997.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/letis.pdfIn PDF document text
    • http://ltpbetel.ro/userfiles/file/65817299149.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/73073422007.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/24182878733.pdfIn PDF document text
    • http://minerva-collection.net/files/files/37334181616.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/muzobirawumepujedoxisipu.pdfIn PDF document text
    • http://hasomedia.com/userfiles/file/50513800055.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16134368bf3573---25149060361.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/20654062852.pdfIn PDF document text
    • https://santaclara.com/wysiwygfiles/file/murogemasumat.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/61805700892.pdfIn PDF document text
    • https://vitanov.rs/files/11744933655.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/uvjbpc5034n885mvdafpe60mne/7792660056.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/213444837261323f94d7432.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/sivilovokoralugulinir.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/nasewaninojomesosoti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=font+30+zip+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5AA 15868 bytes
SHA-256: 238cd77cb419348de079fc20b8622cab2066b941506b873b2c4d7812a9317751
font_01_sfnt_off0000de75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE75 16632 bytes
SHA-256: e896d0c9c6509c93731645541c0836c845742b74f7fde2e8ff5e94baacc6a6a0
font_02_sfnt_off0000f607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF607 10220 bytes
SHA-256: ea0b47a71b51efb37960bc33df5a5bcdb2ded76b021b51ff4c095e604e2996a9
font_03_sfnt_off00010d1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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