Malicious PDF — malware analysis report

Static analysis result for SHA-256 908edbffe5820c18…

MALICIOUS

PDF

79.7 KB Created: 2021-09-22 16:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 451b60e8010d6aec54ffcfa05fe16eac SHA-1: bc269c9317d9dddc0dc47d09855b262fd8c618aa SHA-256: 908edbffe5820c18847e85b279c468646ea21c90a4e85b3f1e47be14117b4f7c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised hosting or disposable domains, suggesting an attempt to obscure the final destination and evade detection. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://nexxosrealty.com/userfiles/files/37271383101.pdf In PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/98597274855.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137c4683901f---bezagitijumezel.pdfIn PDF document text
    • http://phfamilyrestaurant.com/uploads/files/risavevis.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/30703397050.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/tuzeluvol.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d10fbb95d---93423367628.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/4172652a12aac225cc9ada80e9660e60/91452393079.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/99669098447.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/sivakipubevew.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/kinifudigimibomuge.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/jajuwojujuwel.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/79981519036.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/31517061352.pdfIn PDF document text
    • http://iviltra.lt/images/files/jofazaxatumowama.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/fafifevexobetedidafenu.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353eb3b6e9c---46809294303.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/vimafepuvekudovaxodu.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/xoxabukipok.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613df483924f4---98638119134.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/simakatixapizukosu.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/gogifavati.pdfIn PDF document text
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/fagubisugokakafetetudeg.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210901063732_o1muwv.pdfIn PDF document text
    • https://shinaltd.ru/images/file/63905411675.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=the+conjuring+2+streaming+vfPDF 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_off0000c9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B1 11116 bytes
SHA-256: 4acd6b62d48db2954db8b2722316b25ce6f6d7e75690d5413ec2c47d2531b269
font_01_sfnt_off0000e388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE388 20008 bytes
SHA-256: 733ec2d17eb04330b6bdbf8672045941a40068ceaa8c02cf0f51428bd810db1a
font_02_sfnt_off00011789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11789 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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