Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f656955aafc5482…

MALICIOUS

PDF

89.5 KB Created: 2021-08-17 14:03:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3523bb7f2e9cf67bb3452fe8d7e87537 SHA-1: 49caf2768caf5f3f72a5ba7348db8df8d59538df SHA-256: 4f656955aafc5482b2aecb819fb3ac7344034c5773f1220a0e8b025ae38a6e27
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. Heuristics indicate the document functions as a link farm, pointing to numerous potentially compromised or disposable hosting sites. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://gccde.com/downloads/blog/geust/files/126996985.pdf In PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lolebabekamutasarakafid.pdfIn PDF document text
    • http://asfcursillo.com/clients/879797/File/1360608648.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/hn6i4a3toulejuf2jicrru2o8g/pexojafiz.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/wedopilatomapomoxarizi.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/qef9tk4iktm5ss3me76f1ac3pv/72418674750.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a19185be6---sopusodituduforigino.pdfIn PDF document text
    • https://vieclamkinhdoanh247.com/upload/files/zesipo.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/jokadisuxenebozago.pdfIn PDF document text
    • http://yaan121.com/uploads//files/202107301105472999.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/vepojopexonunipewu.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/32856346411.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/valepemusowaxugavugugisi.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/boxegetetufev.pdfIn PDF document text
    • http://miamiokclassof65.com/clients/d/db/dbefc63a503cf3d3a4f9fb61678ecc08/File/kuziwamolalalojosarawive.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160f1819526784---dawodige.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/85308715408.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/52743774797.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb48882783---jodepujemu.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/eo54q7dibc9b7rlcjct0s1u76c/94350357474.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/xunesaregekekinaxizudox.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/83588930035.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/62435830451.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097d2851f68d---nizopipugafenulinaze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+adjust+pentair+valve+actuatorPDF 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_off0000fb6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6E 16400 bytes
SHA-256: ba78de623942171f9ce75d7ed79f39d6418d0724ef19f09772a854059550f3e9
font_01_sfnt_off000125c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013dd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD9 10880 bytes
SHA-256: 7760514da4b49c572c3daf22ba5cb8e337dbd99bc446c75cd3299fd03076d1f6