Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0063de5d904b1ea…

MALICIOUS

PDF

102.6 KB Created: 2021-09-02 12:37:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 07989948260b9846a404d3e91a3408b6 SHA-1: a672129bc4c1530701c35a27727396849f436d55 SHA-256: b0063de5d904b1eab833d93767dee280947ac320a151d95ff17670b59ef0ca94
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised WordPress sites, suggesting an attempt to trick users into downloading further malware. The presence of multiple links on disposable hosting and the use of UTM parameters further indicate a phishing or scamming operation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094161823bb4---rinul.pdf In PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c739a9872fc7db8710b830e5b5aa2e6d/57726992584.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///lipikutepetafaseko.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/cbc96a2485b24ef7bf5218d59df7830d/14514640323.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607573653e7ca---nizedofonokibusivufi.pdfIn PDF document text
    • https://timjanen.se/anvandarbilder/53/files/57345899373.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/daj0mq61v85g3rmvkmqdfmjp33/rimebe.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130436c8e228---jodezopimawemupotejak.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/mugajal.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f2797f246d1---jusojoboronozuw.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160b1116514ab8---81500328413.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607616e11bd54---81145559272.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bf3c9687d14---53091753792.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/rolagowotetun.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e41f89a94---tejepebale.pdfIn PDF document text
    • http://k1a.ru/images/files/file/41331990390.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/17051343957.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/21543546124.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/9180986420.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/42f4ca9cd2139506e2de820191ef625d/60810346301.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/52397731721.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c47235d8bea---23642399067.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/nanumexurasutaxazoruwok.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/18380475084.pdfIn PDF document text
    • https://e-midas.ro/files/file/kuwaferemufewuronigisi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=si+units+prefixes+worksheetPDF 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_off000126da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013eec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EEC 20084 bytes
SHA-256: b8088241428e4146f5c6f7d7cb1995371d79a4008719edcd2018b1a3634b807d
font_02_sfnt_off0001743f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1743F 10700 bytes
SHA-256: 5f349e5c9fc107115ac0fffb6b8e9b7429ead9e784a8863da3bcbec39b6ce81c