Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a61fe4327b034ec…

MALICIOUS

PDF

100.9 KB Created: 2021-09-21 07:29:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e9275297d1552493c83878780d8080b2 SHA-1: 7c9180df372d02f713da05880318b2c9caca4aa9 SHA-256: 2a61fe4327b034ec1f43e6c233741797b8318a8611be1b99559a75eb95935f0c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

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://silverlabpupsforsale.com/userfiles/files/vozereluba.pdf In PDF document text
    • http://vonschickenconcord.com/uploads/files/mevuzepabazekibawesigot.pdfIn PDF document text
    • http://f1-rennsimulatoren.de/userfiles/file/63498077291.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/pikanituju.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135cc16e0426---juzemovozevitik.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/zeluluzo.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/3243918893.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/98714881604.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16146dc599fd97---53789067933.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/51665165889.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/6f31fe614eaec3491996b87a154ce66a/dakeguvurotij.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/momaferojugovovokojito.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/fc96b7f043b63225b9d5ac43f599dfe0/20055839259.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/26574982290.pdfIn PDF document text
    • http://tochuchoinghi.org/files/megasamefamiravix.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140eebe8c6ba---35802556523.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/xufewelukibudub.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/wakuwutuluwulejofe.pdfIn PDF document text
    • https://inprovitbrasil.com/ckfinder/userfiles/files/vuragazozulagenifizefixid.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/28268399244.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/janubipejasoguzigutap.pdfIn PDF document text
    • http://gfk-schwimmbad.de/i/File/gitafasigexowazo.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/89407584071.pdfIn PDF document text
    • https://xn--90aweabvm.xn--p1ai/ckfinder/userfiles/files/zowumamarukamuxurikiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=plants+vs+zombies+tm+2+freePDF 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_off0000fcdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDC 10764 bytes
SHA-256: 060fdab8a17322d1b92eedcc967b6ffd808f0c14d87eb2bd695991a729f9d26f
font_01_sfnt_off000115bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012dce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DCE 25200 bytes
SHA-256: 21d59107aaa0bae98e40d2481e4d31509fa15dfc194cadf849329f4b3f5a76d7
font_03_sfnt_off00016e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E0D 16668 bytes
SHA-256: e468cdcc457ded3948e1cd5af7cc2175e53b15e267f286d9cbd7c7d26de0fbac

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