Malicious PDF — malware analysis report

Static analysis result for SHA-256 38261d541c599b96…

MALICIOUS

PDF

74.6 KB Created: 2021-09-21 12:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 68b4c36493367f67ca0fad67e0e6e1ab SHA-1: a2f81deca613c320f72f31144d1cc92847c6a8bb SHA-256: 38261d541c599b964fe440ae1e9313dbd71b9f56755730ccd5e6e741e4589994
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The document body is heavily obfuscated, preventing analysis of its direct content, but the presence of numerous URLs strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://drafthe.ru/uplcv?utm_term=weathering+with+you+streaming+vf PDF link annotation
    • https://afmiletisim.com/resimler/files/37490601754.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/torapozobevezoje.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/32021162159.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/025gig8gljq1nqllg2n8s5es30/dakese.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/nogem.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/xanopale.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/54086543458.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///mademufagivujuvesizefa.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090619085073499.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/befedovapariwewudi.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/gasoroxavumepabemejijapoz.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210910/file/16312289399969.pdfIn PDF document text
    • http://brukbet.com/user_images/file/kuwifal.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/81763243060.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/39232182277.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/720nlkq7j34ouoo2cnol7l3j63/92458855629.pdfIn PDF document text
    • http://kgmda.com/upload/files/63443915186.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bomazejode.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613be51a9da78---26241350156.pdfIn PDF document text
    • https://academiesutherland.com/userfiles/file/42094101713.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/35215014322.pdfIn PDF document text
    • http://sushibelovo.ru/files/lebumituvo.pdfIn PDF document text
    • http://dhf-china.com/d/files/81104084421.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210903_5F71BEC5838EFF40.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/52649550373.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_off0000bd13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD13 10972 bytes
SHA-256: 9ac8a62754a0c2f202fd51f1f0293aa1e24a7206f08ed3d0f24a550d4a158a15
font_01_sfnt_off0000d67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8C 17052 bytes
SHA-256: fbdcfe87ceffb32ecdda4767211bf4db2c08b358ee05b9d106b5ac2bf3e1fc58