Malicious PDF — malware analysis report

Static analysis result for SHA-256 15d5e4e10a8de5e2…

MALICIOUS

PDF

78.7 KB Created: 2021-09-09 23:34:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: afcad1d528227f7b987cb495fd46eaa7 SHA-1: 2ba6ec4df84bbd01845c1f3d64867c8fc69bd5ac SHA-256: 15d5e4e10a8de5e255fd5a5e6253ef63cdabbf5767d731a816034b32ea505d41
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to distribute second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://nomylo.ru/uplcv?utm_term=free+game+roms+for+android PDF link annotation
    • http://seattledesis.com/fckeditor/file/84423399295.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/4421749612.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131b1d36025b---13200297915.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/ninozale.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/gewavowanamenifuvemelu.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/46728029603.pdfIn PDF document text
    • http://101balkon.ru/upload/files/wexewemexujuxilikasosagi.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021090923521273499.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/9993049f2dbf3c81e673e6ccf4c4ef63/naxisopugexamumoterev.pdfIn PDF document text
    • http://partnercable.com/files/gezowufe.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/mulexazenepevakuwok.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/sobipamigojurowugemazoje.pdfIn PDF document text
    • http://thecargonepal.com/userfiles/file/kowilomagipomamisexun.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/14649733892.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/savurokipoginuzavubaja.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/63708174212.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/radafavesu.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/29034306871.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/050222126020.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/62258175539.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/sifibekonijanomidav.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/76a2ecf8df8a6aec76b11298bfb095dd/kukanebofotan.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_off0000d2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC2 10532 bytes
SHA-256: a434ebe680ab1bfb0797f5bac92310b47fa143aba2fe845d5c23f7a535ea0b97
font_02_sfnt_off00010277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10277 16896 bytes
SHA-256: 1a3955cdf5eafc74dc6594c26c8b26f92079c43e74fe3219c20dd833efc78b8e