Malicious PDF — malware analysis report

Static analysis result for SHA-256 98ae43f50233544a…

MALICIOUS

PDF

85.5 KB Created: 2021-09-10 02:01:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: dc9ad55e3dfa1822cb44fb5391fda01d SHA-1: d7878604a633078b06733d9303fc134d3668b778 SHA-256: 98ae43f50233544a9d373ad95ebdb03d3e0847ddf1df491c41eb21d703f91879
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. Heuristics indicate the PDF acts as a link farm, directing users to various domains, some of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://haisushitogo.com/uploads/files/21975185407.pdf In PDF document text
    • https://autonoleggioassereto.com/file/jimupilegosagazedito.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/83430234924.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/68424724927.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/59610822295.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/doruxizopumulatevojimo.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210907_095717.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/felejuwitoxonuno.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/26439885841.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329a5c15dc0---21144992458.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/8140299385.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ee2a133d0---pebogibigorus.pdfIn PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/topaxiroraz.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a91824c60d---towana.pdfIn PDF document text
    • http://thayloilocnuoctaihanoi.net/upload/files/tosukux.pdfIn PDF document text
    • https://e-casainteligenta.ro/userfiles/file/fasijukidobiba.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210902_43437C01D84C309B.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/27101035308.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/41416255044.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/16596168523.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/zamupi.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/45714986384.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/sedirufonovawad.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/tojexisi.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/65308198770.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/kezusabi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=mobile+legends+script+diamondPDF 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_off0000ea4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4D 17396 bytes
SHA-256: edeeced109d555613949652e72dfcc55f86a71649aa695ceb6bd8e49ffa47e75
font_01_sfnt_off000116f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F0C 10992 bytes
SHA-256: dcdfecfc9722fe78ebcd6f1efc5d416b0f2f95a02080d4d308512545073fd71a