Malicious PDF — malware analysis report

Static analysis result for SHA-256 230e9e8588b15c61…

MALICIOUS

PDF

85.2 KB Created: 2021-09-15 20:18:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a6775b530b59f8b64eb66c3d1e1d83b9 SHA-1: c3f5e73be25b69e2cb14687a600cbfefc18b9a6d SHA-256: 230e9e8588b15c61cf45f6abc5ae0e0bfe14391300612d8cb675ffb73528b9a3
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to potentially compromised or disposable hosting domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest a malicious intent to host malicious files. The embedded JavaScript likely facilitates the download and execution of a second-stage payload, as indicated by the 'PDF_JS' heuristic and the overall context of link farms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 8

  • 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.
  • 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 http://kientrucsangtrong.com/plus/files/83030207311.pdf In PDF document text
    • https://huangs.tw/uploads/files/202109131611454186.pdfIn PDF document text
    • https://un7un9b3rl1pa7-99.com/contents/files/80263694831.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/gifipisa.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/99662702617.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/14361038624.pdfIn PDF document text
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/86857451604.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/samujekesisepesanakutor.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/72812800656.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/tiwagezutudevide.pdfIn PDF document text
    • http://balalajka.nu/media/riwezufub.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613356c368fce---roduk.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210914_074E1AECAD8C9E25.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141f2f08afbf---ponuvuwetiba.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/d7513b5b5e28aa1d878ca3fbf66fbb1b/wakememoruwarel.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/32903823218.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/silepobomukamimixitajot.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/41617889511.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/2655457734.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/66097385575.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/98607205451.pdfIn PDF document text
    • https://hssanesteban.cl/files/kezufotetekamemivut.pdfIn PDF document text
    • http://gulfcoastlist.com/userfiles/file/joworugu.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/28219508867.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/0i3imvut1rbkg9d7t0tkan18l3/66412471793.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/45567105249.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/fejafigapekoxodefop.pdfIn PDF document text
    • http://innotack.com/userfiles/file/70657583887.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=the+monk+who+sold+his+ferrari+book+tamil+pdf+downloadPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A7 11044 bytes
SHA-256: 5b9e46e731db93033fa019bea2cfb3435ea1020991b66743995049bd8d3da9a3
font_01_sfnt_off0000fcfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFA 18992 bytes
SHA-256: 992a664c5abb4f8369f804f487978f86ba38297d185984bf70e262761aad02dd
font_02_sfnt_off00012df3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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