Malicious PDF — malware analysis report

Static analysis result for SHA-256 416cb8e34a9b1519…

MALICIOUS

PDF

89.6 KB Created: 2021-09-01 20:14:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3757682b74fb3d7197017069cf99ab92 SHA-1: d2f5d9e507b538f815411ddf05aa109ccf45bd20 SHA-256: 416cb8e34a9b15192c4ee843aa2ce78b828f6d208bd4ede7d6bdc3c9b6ed89bd
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed to obscure the true destination. The presence of algorithmically generated URLs and links to compromised WordPress uploads suggests a campaign to distribute malicious content or phish users. No scripts were extracted, but the PDF structure itself facilitates redirection to potentially harmful sites.

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 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.
  • 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.
  • 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://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/panezinabunejipogipafuvif.pdf In PDF document text
    • http://www.jindatunnel.com/up_files/file/57626070493.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/zibawifitexelepopam.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/lenapa.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/zosijudaki.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3074ea4362---23303810813.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/94603343556.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7ee8be60b2---fejadudaloxag.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/545b018b71bf9215500abb6e2d6f42fa/82853700007.pdfIn PDF document text
    • https://designclarf.it/file/xatujemelalavo.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/20245912036.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/19444123212.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/j07k9np48aqgmujgjefcsc716j/julowewofalo.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/d4a7e4f0b98e19713b88e24d8cf1ec8a/sabatox.pdfIn PDF document text
    • https://faguaflowers.com/images/admin/file/82081563749.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/80216403911.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4577ea2ce---16327239288.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/tifetuf.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805acce209b---41461122458.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/21bfc765dd7f1a728e35991c4381c652/57102029020.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/fewebipakivabonidijepo.pdfIn PDF document text
    • https://humicdp.com/uploads/2021-07-28/images/files/libularova.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/do7ernkaf8sdi1rkbsjihpgs77/89960773635.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=relation+between+sound+intensity+and+distancePDF 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_off0000f4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DE 10748 bytes
SHA-256: 21b0eb26582ee7115d0840f52b54a3a0257fba506a74029417bb22272b8c690c
font_01_sfnt_off00010dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC5 19240 bytes
SHA-256: b6cc55ab41241fd9f588f21140406ff2b6e9ace7ea6ea88be351c2cbb9306fa8
font_02_sfnt_off00013f3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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