Malicious PDF — malware analysis report

Static analysis result for SHA-256 b70f5fd8fe4ec27f…

MALICIOUS

PDF

72.1 KB Created: 2021-09-13 19:17:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7a59380df44adb3d7c5bdb63887866e4 SHA-1: b8883dde97ff13cc9ce54480823160485b7ec0a2 SHA-256: b70f5fd8fe4ec27fe69469cc6300546badba971e3b76743694b6d3f4df433244
196 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and a lure to install browser extensions or updates. While no scripts were directly extracted, the nature of the lures and the presence of numerous external links suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://sdhouse.info/ckfinder/userfiles/files/garubujegiriwitoxoveja.pdf In PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1613e933ed4220---88428090777.pdfIn PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/wimebofib.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/91869503758.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/tepupim.pdfIn PDF document text
    • https://bdlvn.com/steel/upload/files/wazuwojuzimor.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/dujepikalijukit.pdfIn PDF document text
    • https://dbhattacharjee.com/ckfinder/userfiles/files/1378522307.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/nisevigerorekojixekulu.pdfIn PDF document text
    • https://salonrewards.ca/images/file/35524422842.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/97423477196.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed41a8c4fc---dobujad.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1613646b674998---davekarujuduxetupefek.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/11885861852.pdfIn PDF document text
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/jezisupapepoboto.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/9669278510.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/91945643093.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/98351683027.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/xagurifunam.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dafufoj.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/35866269122.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613477d7058c6---zolidawimogawujud.pdfIn PDF document text
    • http://iuf.kr/pds_down/files/vevaxotewegavon.pdfIn PDF document text
    • http://snft.ro/media/file/ruresujeluvuriwafugaroluw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=adblock+plus+android+version+apkPDF 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_off0000b9f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD204 15716 bytes
SHA-256: c52ca308d58c2687adeeb194c2c6e12e14ce4ef9498ccced68440d104d14a6da
font_02_sfnt_off0000fa0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0F 10788 bytes
SHA-256: 5c297d3fb21f3f7cfd3c158dcc27aae710861534ccc0093e0182f3e75b4513e9

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