Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a5820bd0d095eb5…

MALICIOUS

PDF

77.7 KB Created: 2021-09-01 04:56:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4f7aa18584c479d287b9ca5c75e8ceaa SHA-1: fe0c886add01189ac420dd63ce5aeab70947170e SHA-256: 6a5820bd0d095eb5782a844087db27171269cf849e6ed6533a094c3116d51ce4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to external websites, many of which are hosted on compromised or disposable domains. The presence of JavaScript suggests an attempt to execute malicious code, likely to redirect the user to further malicious content or download additional payloads. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 https://chuyennhakienvangvn.net/upload/files/7791977255.pdf In PDF document text
    • http://nwatchonline.net/userfiles/file/zaleteridiwidonet.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/l1uogcu53603spuhj2api2idq1/32863982697.pdfIn PDF document text
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/zenusejerak.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/1561340548.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/divuxiridenozujikitaloju.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/783d5aa8873fe29be17cd5aa327e488d/59188195462.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16098f945dbfae---bubaxotixadug.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/fexakeraronejiforolov.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/349u4i6k6oh8mbc3c6eqaub16a/mobesefimizedejowogom.pdfIn PDF document text
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/74356569221.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/xififamiwuvumotoleviki.pdfIn PDF document text
    • http://ttc-investco.com/img/files/lewujofaduburosujagavi.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9afbe2dd7---2325958549.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/89597209332.pdfIn PDF document text
    • http://qhs1978.com/clients/d/dd/dd8db5a278a7ad55a2ada34b8e38ebcc/File/81905529351.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/keranumogibaxekajajulazog.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/a0921e9fc15bafc10f06e399180cc52d/92175302229.pdfIn PDF document text
    • http://one9five.com/userfiles/files/xelade.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/tedofavasiror.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/mavulegoteba.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/9cd1b137380ec8d02b0028b455bda3fd/25103163244.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/balobem.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611315dd1c557---15858907114.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=mp4+to+mp3+converter+apkPDF 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_off0000c9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e20c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20C 10632 bytes
SHA-256: 23d6aee7973cb84789efbd90ef61d133559124536cd520d0ae904ba594aff1ff
font_02_sfnt_off0000fa77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA77 18116 bytes
SHA-256: ddd881d732823f6b3a8999cf0222d74eb9c4202a82d9d4f86603f97de3b7191e

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