Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3113796217c0a96…

MALICIOUS

PDF

82.3 KB Created: 2021-09-15 15:09:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b7973103c1d9348de7362d290ba35bba SHA-1: 3f309242a2f1b608a7037878fd4797d069c7fff3 SHA-256: a3113796217c0a969e93bebc01e8b4dd910333fb184d9e8acc1438970e734cbd
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1071.001 Web Protocols

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external links, some pointing to compromised CMS uploads and disposable hosting, suggests an attempt to lure users into downloading further malicious content or visiting phishing sites. The heuristic indicating an instruction to disable security software is a critical finding, reinforcing the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://huntic.ru/uplcv?utm_term=lego+jurassic+world+apk+2020 PDF link annotation
    • http://kpdb.org/userfiles/files/rifoxugare.pdfIn PDF document text
    • http://rulada.by/upload/editor/files/67236462381.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/49357486082.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/9299388945815c2e520c951aaaf39ed0/34399929258.pdfIn PDF document text
    • http://mascotdd.com/file_media/file_image/file/41091829690.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/bekov.pdfIn PDF document text
    • https://ka-base.no/images_content/file/68226520041.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/relageluz.pdfIn PDF document text
    • http://drtamerturan.com/file/68717755071.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/64979266430.pdfIn PDF document text
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/18684692225.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/fv90ea5u6hb92p7k5c6tsmnjof/kukidij.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/10157404982.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/nonumadapiposa.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/39702196158.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/352726758612f5c09be66d.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/89012018781.pdfIn PDF document text
    • https://zhansq.cn/upload/file/35926796129.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/6508845311.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc1a67e91b---51334689611.pdfIn PDF document text
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/73916276889.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/popopol.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/pezitewew.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/13306800857.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109120151092920.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/relemewatuvanogokef.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_off0000d7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B4 18608 bytes
SHA-256: f55f2649524d227b6a2c767ab4cc74950a38d3304f79262a409fb6adfd69931c
font_01_sfnt_off0001081a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081A 11096 bytes
SHA-256: b28f53e89a7f949007a409b9b9e504a488abcc650033a41c28f3644677ea9e1f
font_02_sfnt_off000121f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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