Malicious PDF — malware analysis report

Static analysis result for SHA-256 da04bc685ce1d151…

MALICIOUS

PDF

80.0 KB Created: 2021-09-04 00:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5115112ad4f3a4175c97a476c11a46d4 SHA-1: 804ce75403ec93c895d5ea21435f929757dbf11a SHA-256: da04bc685ce1d15127c808ccfa6e3f5c56281d8878e2e2f3e03eb72b95bc6b33
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing users to multiple compromised or disposable domains, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to malicious sites, potentially exploiting vulnerabilities or delivering further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://10glazsikeyrosa.ru/file/91615504031.pdf In PDF document text
    • http://daiichihr.com/uploads/news_file/64216210235.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/82185580611.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/zasoviroruzuvupojug.pdfIn PDF document text
    • http://www.heksan.com.pl/file/66411486502.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b81e317ff16---7015832972.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/28892942158.pdfIn PDF document text
    • http://hilltoplancers1975.com/clients/13753/File/zulagadidagobonexaxinif.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/5cbc220df7e9c67af7fdf4c7a99b812a/tijifege.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/e7kp30h8sld31f3nde3dbd37pk/43682154399.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/risuled.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/52901070885.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091f5c3b110f---17879931651.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/78b0e9693e43a392a1fdf98b29723986/mosarasemopofiz.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c3c420f88---nidugiwagezakaxidagaba.pdfIn PDF document text
    • http://sparkpro.lv/content/file/48797233933.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/sanajubulebalevivekij.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/subulu.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/54813081934.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/muzoduwug.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/bodubajawizu.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/71610790285.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/8ce5eb6d18950cc073c2df9118bd6166/38192848672.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b44fd50b7a0---bunijituzebowuxokaz.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/f89f4858d85c28673e9d6f823ce718db/90260049330.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=shape+worksheets+for+toddlersPDF 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_off0000d849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD849 10652 bytes
SHA-256: 39d30c5febfb7652c3ef7aff85d451482a18812307d2b55ccc9e7117b4e4ae6d
font_01_sfnt_off0000f0ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FF 16180 bytes
SHA-256: 94161716e1fb95ae4aaf8bf3419e446e406d694d457cac3e5cf7d935a0a9d0fd

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