Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd2fba41bf8387f1…

MALICIOUS

PDF

75.9 KB Created: 2021-09-03 19:32:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 389d911a10571d1bb1591b336e66c5e1 SHA-1: dded146b3c7425b24c125ffebb4885c14f02a9cc SHA-256: fd2fba41bf8387f13192b8b6587ea9c5c710a16e88d209a2874db924c1e3b552
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a link farm that directs users to multiple URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish users or lead them to further malicious content. The document body is unreadable, but the heuristic firings and numerous extracted URLs point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160908c365d49d---tamanetepojafuxilotojeri.pdf In PDF document text
    • https://mkart.it/uploads/file/3963908365.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/jobugabupekawuxoxul.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a791ff378fd---forawedejib.pdfIn PDF document text
    • http://gtshotel.it/images/file/bozudapolo.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/nogutojejobuneluv.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6defb6044---2225408999.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/19263158955.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/jobeludatet.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160c97588eaf60---91042108776.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/54785863660.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/5961180289.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/51600152813.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/c7ed3412fa7cfe2d18b10179695268b7/92260730633.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/0648a8a50d93431ae7881d050aaa1151/40386966559.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a379470203---12834815541.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/415432cb8e98764d692adb99293626f4/26901147872.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d647793fdb0---47168802587.pdfIn PDF document text
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/rasunopadalemobujisexuvod.pdfIn PDF document text
    • https://lasanisports.com/files/bezezazol.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/26500479440.pdfIn PDF document text
    • http://5uempat.com/contents//files/6538903909.pdfIn PDF document text
    • http://marty-triple-m.ch/inhalt/files/45957912892.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/lazaluzerokomexadi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=goodwin+a+history+of+ottoman+architecture+pdfPDF 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_off0000bdcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDCD 11180 bytes
SHA-256: 5e04a539dfe89812976e0b6b5c2872e821989f92817c72ae3ed2981ae8dce464
font_01_sfnt_off0000d7e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF5 19068 bytes
SHA-256: 8eb5d19c33e8fde07da18883e24d5792f19559894cb0339f3a59b94bcfa3f160