Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ce1cbfedb53f05e…

MALICIOUS

PDF

85.8 KB Created: 2021-09-01 19:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5a18819b77307a660ab533c537079816 SHA-1: 95ffa1010d40ac10857b606c9e5a439d657a89be SHA-256: 8ce1cbfedb53f05e4b9382ae13deebc14b859bfc5fdca5423b8f626b9f6ce0fd
164 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs pointing to various websites, many of which are hosted on compromised CMS platforms. The presence of 'utm_term' parameters suggests a potential phishing or tracking campaign. The document's structure and the nature of the linked URLs indicate an attempt to lure users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.allterra.group/wp-content/plugins/super-forms/uploads/php/files/3b83ce50f992d828fa92606746626042/ketela.pdf In PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/vipoludig.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210530150613.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/tubofojetumagepejizoke.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b6a3b2e23---69804121188.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/v1mvc6bgmdq4c1qqauvubqlmme/tekosew.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16119159b02646---56668157705.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/411e4c6efcfdc97fa48ac274e35a925c/66086078235.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/85004834034.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/jexuwo.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/48396943498.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/i5nvuf1os3up73dfsqg2lifvkd/nuvogevomote.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/70507877070.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/22139556499.pdfIn PDF document text
    • http://donationwebsites.com/clients/6/68/68901b9e08e997a22fc64c74502b39ca/File/tijasevuropa.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/suxabijegan.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/ia28uv0k2a41klah4tu65fbpd8/gakoxop.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/86821831668.pdfIn PDF document text
    • http://chanhbon.vn/media/ftp/file/35316435792.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a33b271d08---23423382587.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612370581ff23---50501130975.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/tuqb6gk419bf7veru2nn9oes1l/54074209003.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/jatofukupasu.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/98689873.pdfIn PDF document text
    • http://bracyfamilyreunion.com/clients/c/c2/c2db1a97f769835965582c74015c7782/File/93110833855.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/jezutogoroposiwexitur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=afk+arena+is+it+goodPDF 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_off0000e68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68A 10556 bytes
SHA-256: 4997287ecad23dc26ecdfcfb73bc3545526b740f95146f0b930596e9a83e9f20
font_01_sfnt_off0000fe94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A6 18992 bytes
SHA-256: 0eb828149524c97feae1fcb65588404349215b779a61cd584bd861b69f990422