Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8a48788d7b3be9c…

MALICIOUS

PDF

80.3 KB Created: 2021-09-17 19:32:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 83fa86d7e3d1f20c2724a9166e544cf5 SHA-1: c9ee50949ff7ddc68a5f82baa19fb7f02b06f36e SHA-256: d8a48788d7b3be9ca6acda664d73c0b95a22f62acc60c8249064a9c0bde3a461
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised and disposable hosting domains, suggesting an attempt to trick users into downloading a payload. The presence of a 'download button' lure and callback phishing indicators further support a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://nut-shell.net/upload/files/volotutapibudez.pdf In PDF document text
    • https://sibois.eu/userfiles/file/14407313029.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/79852026883.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/0e68fb93240411e1c81fee871e54f35a/66276572933.pdfIn PDF document text
    • http://ferien-in-zahren.de/images/file/pakixemuvozapusepun.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/vofonu.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/fujisuruvujivoxogigez.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/jufupivibufofajufisaji.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/22560416467.pdfIn PDF document text
    • https://patc.fr/imagesfile/sitikukexoz.pdfIn PDF document text
    • http://chinalabware.net/d/files/lusagefake.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/pokafuj.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143244ed2ff6---1920463227.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2286b277b---32644383286.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b832f7488f---90328839002.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/90418196975.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/31957124034.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/rasifakumutunovatame.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/35409540765.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613361ec389de---33348903086.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/a6095033f584170a73041ac2f99cbacc/48410994169.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/jopupelimegosimalisilima.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/sukodufenekanizuvupozadem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=free+fire+vip+mod+apkPDF 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_off0000d4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F5 10380 bytes
SHA-256: 9eadb409527a6a23ec858e20d6832336de82c8a6fbfb65c2d2134117355f6b0c
font_01_sfnt_off0000ec64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC64 18316 bytes
SHA-256: 72c6f97735e0745bef139211d0be0cb5866fb2caac9efb58dd986d2f5b5eeba6
font_02_sfnt_off00011bf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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