Malicious PDF — malware analysis report

Static analysis result for SHA-256 65df40933bc485ba…

MALICIOUS

PDF

92.8 KB Created: 2021-08-17 15:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f626de4b153dc6466b8372a82cec1b84 SHA-1: ee2e7bf8b8e2ba999166219292691b444558a7c6 SHA-256: 65df40933bc485ba24f837e727735d3e3c5575a1050c6c4549950b7b63441cda
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, and a specific URL with a UTM term redirector. These elements indicate the document is designed to act as a link farm, likely to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://pistant.ru/uplcv?utm_term=don+juan+moliere+pdf+t%C3%BCrk%C3%A7e PDF link annotation
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d1b4d5c5b---74440392291.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/zixipezenurejunidurojifax.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce2d03deea---ruvotinogixedejenaje.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/59083711837.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210505045818.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/somipowumimun.pdfIn PDF document text
    • http://sclifeguards.com/clients/16854/File/dejoxeriwadinak.pdfIn PDF document text
    • http://tjclassof1971.com/clients/1/16/169b02496b2253913efe31a5b05f4f66/File/rexivedamidov.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/duvesamemonarifo.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/26215721101.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/xuluwite.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/6319451i18sj1udlb2udcss9c5/bakagosojakef.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/pajaxon.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/zukoxikezonubetev.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/mojisibibuxobi.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/wumojesapufeveziwotede.pdfIn PDF document text
    • https://ebooksweb.net/files/file/83864824744.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/ninut.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/002af477ab4c274eec4a79b8172229bb/tikovivowawiwepofote.pdfIn PDF document text
    • http://coopmong.com/ckupload/files/4118464648.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160fc0c59162e7---3619612796.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983c9e92a4c---76879717967.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/zedejatiraxodobiz.pdfIn PDF document text
    • 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_off00010306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10306 11204 bytes
SHA-256: f4568e33cc18e34576219eaf5aba227fa1260fbc71bdad63d012627bddc2f8a9
font_01_sfnt_off00011cd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD6 19660 bytes
SHA-256: de9ee0646327be070858b654164ea5ef2558350143e25e17a12c0f540ee6789c
font_02_sfnt_off00014b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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