Malicious PDF — malware analysis report

Static analysis result for SHA-256 e654ec0db6641f43…

MALICIOUS

PDF

71.0 KB Created: 2021-09-22 11:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 09139e1953dcfed8c94cdff9c45c0747 SHA-1: 43d8f6e6078acf31443d226b6f89abd3a1a86d4c SHA-256: e654ec0db6641f439fb33d5e2760ef96d48f7aefcc732df73039714751ab8513
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://coretry.ru/uplcv?utm_term=wood+block+puzzle+mod+apk PDF link annotation
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/dedalifovun.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/80472761080.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/wuwarutagawajotuluz.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/wuzorirafopupinugubimax.pdfIn PDF document text
    • https://alicantea.centralcms.cloud/galeria/files/kasenexukogimaxumiku.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/kosukoru.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/15849321982.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/netovadedosareri.pdfIn PDF document text
    • https://forssh.com/userfiles/file/97745899578.pdfIn PDF document text
    • http://katela.net/userData/board/file/80569544660.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/vojawujagox.pdfIn PDF document text
    • https://maximaainfoways.com/WebExams/ckfinder/userfiles/images/files/80038658525.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c7a4219ef---nelewivekiwojisepod.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/50275877867.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/29512629784.pdfIn PDF document text
    • https://normec-cm.com/ckfinder/userfiles/files/ginapibumabasul.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/nerit.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161405050136a7---91578451958.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc10b43778---88047183725.pdfIn PDF document text
    • http://mayxaydungthienlong.com/uploads/files/files/muwupuw.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021921148598771.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_off0000b364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB364 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7B 10496 bytes
SHA-256: e1e0585aa134282c4218e1db8367df31379d4b5187650b0cdf5b04368a2afd03
font_02_sfnt_off0000e329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE329 16644 bytes
SHA-256: 6a49040a8b6c65f8793470a538c5c7003a31142d61ca8737d6671b8fe33f8513