Malicious PDF — malware analysis report

Static analysis result for SHA-256 5177989fd825f689…

MALICIOUS

PDF

91.7 KB Created: 2021-07-04 22:26:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5eeb0d93bbfd2c7e14783c478a162db1 SHA-1: 155e764bfd7bfb2da6d16b078a36fbf85d9894a1 SHA-256: 5177989fd825f6896a12ea13388e257f1a8f20933c4126b32882ecd649039811
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it is designed to exploit users by directing them to potentially harmful URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://klimatyzacjaradom.pl/userfiles/file/92369659323.pdf In PDF document text
    • http://jirehenl.com/userfiles/file/071557094600.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210621171239.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b44193736ec---81494974232.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/banuvimokadumonefolu.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210627191112389733mbphg.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/28458539984.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a30235f2978---74641255910.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/sorub.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/fr2p1vvg7fj8meeceiu2vur3kn/minefivosewuxokuvuxipuron.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ada201794a---4774519967.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/a991324d4e4a02d1bb0ef7457912a60a/vizafejiwazoxozew.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/67920347283.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/jj6dcdaqmbhu9dqod3sea7leuf/turaromofuworok.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/5dgbt0d91m4p36m90nhhlhcl2d/mewugado.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/392611d1040f7bd1386dccad3a2f56d2/jaxewizifusigu.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa359352b57---97611268429.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/buhhrpr6u673d17b9mvseohil4/95894224400.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c50fca2001c---79018132680.pdfIn PDF document text
    • http://alexandercdg.com/clients/36029/File/14422915042.pdfIn PDF document text
    • http://envigest.cz/upload/file/dewipotexajino.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/zitogazidekidimu.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/vosezafuzesoperizatato.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/muluref.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=displacement+reaction+exothermic+or+endothermicPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC63 17308 bytes
SHA-256: fe4aaae21725473d6e785992287f7aa039c901cd6b2047a361fc7ee5908a5c65
font_01_sfnt_off00011a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13258 10884 bytes
SHA-256: 851590adbdca2c86becf2fde90aa0d377010e797c91b2308f344702d5d14a516
font_03_sfnt_off00014b4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B4B 16140 bytes
SHA-256: 78ecf8e6b815915fb8d90f682407fa5e2b9430ed59f7c36deee35c1cff9d9725