Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f8b86b884acc2b4…

MALICIOUS

PDF

80.3 KB Created: 2021-09-14 02:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 218e1e4257e91f43ee23362da8e730b8 SHA-1: 03e707d03b74704d784b77d001953e03880da1a7 SHA-256: 4f8b86b884acc2b451d404aebc452f3502f8bfed9e9241d28d292cf1fedcdce2
256 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document contains multiple heuristics indicating malicious intent, including links to compromised CMS uploads and disposable hosting, and a ML classifier flagging it as malicious. The document body, though heavily obfuscated, contains text suggesting a lure to install a browser extension or plugin to view content. This aligns with social engineering tactics to trick users into executing malicious code or providing credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 9

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://philabc.ru/uplcv?utm_term=how+to+get+apk PDF link annotation
    • https://htchninc.com/d/files/gudorusisugokupe.pdfIn PDF document text
    • http://24cvety.ru/upload/files/38530200245.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/zaxofume.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138bc4a45f7b---66861620545.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-8/20210908042914763264.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/83851259053.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/34769680720.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/30380670712.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/pukovegufakaxajekuvor.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/wikasizinasa.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/5776746704.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/23240425590.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/24197895934.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/abr8ne8soq2gl5oianokq24l24/matupufogujiwokowakowaf.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/95063576771.pdfIn PDF document text
    • https://kermanrooz.com/img/files/sujumulaparuwaliliger.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/kugokajarato.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/63176155539.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/f588fa70f087dfa00bbceebcdfa3bc9d/nasabokuzodabixe.pdfIn PDF document text
    • http://hzbaoyan.com/images/upload/File/vilogon.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/nedun.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/redojagedojisumapowabelos.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdf845b631---17917867542.pdfIn PDF document text
    • 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_off0000d5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F7 10084 bytes
SHA-256: 2260f923134bb561446b92b9043388aaaa8edb33a9f030730095920228a22264
font_01_sfnt_off0000eca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B8 18020 bytes
SHA-256: 6ded42c173ea0f8648b4d45aa14f9bca76a3158f318063999a3ff389e7d09afd

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