Malicious PDF — malware analysis report

Static analysis result for SHA-256 8181b78ee2d8cf18…

MALICIOUS

PDF

86.6 KB Created: 2021-09-18 00:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 37965390c467d254c64f8bc6bc8eec33 SHA-1: 715e365e5f8a687013308842a1b7df4f29012091 SHA-256: 8181b78ee2d8cf1852ce3e9f40a2f2f65fe4c2559ad4a67134df6e5ec3fe7fef
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to compromised WordPress upload storage, indicating an attempt to host malicious files. The heuristic firings, particularly the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM', strongly suggest a phishing or malware distribution scheme. The ML classifier and ClamAV detection further confirm its malicious nature, likely serving as a lure for users to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • 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.
  • 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://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2a8c2cb61---kijelemovinizeveroje.pdf In PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/berodolilokitabemi.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/69941076090.pdfIn PDF document text
    • http://sweet-sugar.de/images/uploadedimages/file/lisiwibu.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/nojuna.pdfIn PDF document text
    • http://arsvet.ru/img/upload/49711778674.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/27160178059.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/voxazepezilefawidotedali.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/vuxixalipimefetujorasowop.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0cc41cd0c---joxojewu.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/27331259695.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/fesisazoxufer.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161338c5bde4d9---bavurekokafatal.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e7282e2f2---woxavewevi.pdfIn PDF document text
    • http://nppmaudaha.in/ckfinder/userfiles/files/madek.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/46909121537.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/90679152824.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kebufunemomajapupoxafon.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133db9190ae9---90601716776.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/narefirogopul.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/sozemedesomosapopepudon.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/jofujovil.pdfIn PDF document text
    • https://limsurdua.com/contents/files/pofamoselinutulanu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=download+ppsspp+freePDF 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_off0000f071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF071 10388 bytes
SHA-256: 086643cba9748c59519171767bcc3506ada8b55a5c6cbb3b49575cbecb33940f
font_01_sfnt_off00010822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10822 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12034 17264 bytes
SHA-256: 703a9db9c3714934d3e23224340797ed853937ed80db7c02ed191ba8ebbb7346

Open this report in the interactive analyzer, or submit your own file for analysis.