Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f4eb0a94165666d…

MALICIOUS

PDF

76.8 KB Created: 2021-09-19 08:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3567835031cf4686071d0ebfb0744e30 SHA-1: 9cd8a215e0cee77643a2c3f774ad204953da67e6 SHA-256: 9f4eb0a94165666db439026eb51c5556cb4cb6a4895bf1283a7b62492fa6ce2e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, some of which are identified as compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://emailreceptionist.net/userfiles/file/46027183561.pdf In PDF document text
    • http://mobiliteit.nu/files/3783182216.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/vimefabawusaf.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/12519903915.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/wedirifusemewukegobowo.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/fq9tse7ti1hlh2k666tj4m0ovm/jifajijawagigoja.pdfIn PDF document text
    • http://dogoxuavanay.vn/uploads/files/5142627601.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/11666688559.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/28950476.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143d42792da4---sasujinunese.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eca6d7a766---55983442610.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/83031137055.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/lomuzuwugolidu.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/e8e1fb10d83a59a9c446f83f1fa19f27/mumozav.pdfIn PDF document text
    • http://patrickstaxi.fr/userfiles/file/40148905420.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/3d87e3074a6bcb8633c81c51c6e2eec1/30067462504.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/87227925405.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/28567001949.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/88376490679.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/titikuwizasak.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/vuxata.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=hundreds+chart+splatPDF 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_off0000c7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7CE 10488 bytes
SHA-256: ba1e6dbf011c56e0942d3cacdbc2074ce709bc93fb6c3bda0776abf6e1ed8c13
font_01_sfnt_off0000df89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF89 17704 bytes
SHA-256: c89903bbcfc4074745e7879391d5e0e38510ba3c82b0d33059e5fafb834cab88
font_02_sfnt_off00010dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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