Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8f55f7dd0b700c7…

MALICIOUS

PDF

83.5 KB Created: 2021-09-12 01:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5d10419fccffa15e2da149fa910bd41e SHA-1: c57b11257656feb7be02db85236f3775427ed841 SHA-256: b8f55f7dd0b700c79630e6fbabea0708d90e7343e2866611e5279c70da487d82
172 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a link farm pointing to potentially compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely serves to download additional payloads or redirect the user to malicious sites, while the link farm is a common tactic for SEO poisoning or distributing malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sk-massimo.com/js/upload/files/30190002704.pdf In PDF document text
    • http://medical-1669.com/userfiles/files/gesajikijirikulu.pdfIn PDF document text
    • https://hkpefa.org/editor_upload/file/69374476614.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613659abc433a---49573240808.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/6473404941.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/repazaduxidixirimuk.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/suzig.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e68f3bf87---gamedefakifabevi.pdfIn PDF document text
    • http://www.ghidmariaj.ro/app/webroot/files/ckfinder/userfiles/files/15668117396.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/90591163018.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/xijebuteluredixobifeb.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/fomidetirebibetabug.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/kolilexajejogik.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/vopinalawubenugolelonune.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/q66r2pqa4ek1mss3feg4t662ft/3366164533.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/taxogupuroni.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/19705518167.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/zosibavilumotoziliwa.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/0e867e727f101858f92536289c3dfe71/83153655465.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///nerozafajibefar.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612f289fdcf86---rifosedozeburig.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/vipofubefudutajuk.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/bebimuresoxeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=pogaru+kannada+movie+download+isaiminiPDF 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_off0000e18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18C 17792 bytes
SHA-256: 4bb2a5de301878519a2d42d5f25ee96961873a42d051cda7d8c73477552b6757
font_01_sfnt_off00010f0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0D 10840 bytes
SHA-256: 26ca2a228360dc473ec81d3514b1ad1803acfb1c338ea4334f2dec47aa3dab99
font_02_sfnt_off000127f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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