Malicious PDF — malware analysis report

Static analysis result for SHA-256 455cd688ca5c6521…

MALICIOUS

PDF

89.4 KB Created: 2021-08-05 01:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f91ae81f635a0fa9fe174b090520bdad SHA-1: 15b9add8f7e58761fdf63630e36a9c61a09f453f SHA-256: 455cd688ca5c652167ba90ad8fa9227d886d444131ca67a0e3cf1d29ee0c86bd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially compromised or disposable hosting, suggesting a link farm designed to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document designed to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://prochem.vn/images/uploads/files/rufomikuj.pdf In PDF document text
    • https://eternalbliss.net/file/41757727716.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a8146fe3f23---vumudi.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/71887405326.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/rarepumezifani.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/3781817211.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086a80d177e1---48680733853.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d6715625395---sabelegijipadesuj.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/40142030032.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/0ad6d0d03cb3723fcaba49f6d8284921/navetixokunifitug.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7cd3151254---gazurefirajar.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/ead6de1e201df571277518a3392ab58d/33770625764.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/rizizigipanapaxim.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/38718629935.pdfIn PDF document text
    • http://rc-modeller.se/images/file///44606729262.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/xiboxisukuz.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/3492569091.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/r66h6nc1a8lv7tejmfeuhv7mm4/59546922688.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f97980a2f2---31355917840.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/94627073602.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/kapowepe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=cartisan+spinner+900mah+instructionsPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/50ab18eaf7d920525ffd7123192af131/80297875388.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5d6b2559c3---zeroriranipovemejej.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_off0000f6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F0 11016 bytes
SHA-256: f3877aa2eb226f326240652ba9ed2d34dae560ce765726261ab02862010ce9a0
font_01_sfnt_off00011058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11058 17720 bytes
SHA-256: b37c8bb0b74348d8d79ff2fdda472d9faa47213955ceaaf635134f52629bc48a
font_02_sfnt_off00013ed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ED8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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