Malicious PDF — malware analysis report

Static analysis result for SHA-256 f718c26b2fe4fde5…

MALICIOUS

PDF

76.0 KB Created: 2021-09-01 00:10:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: de03c65d5f0bfad0c3f7a8587cfe7283 SHA-1: ac9c79ea737cf50ab7e9659ed13163e00a0a150c SHA-256: f718c26b2fe4fde50f956b89863756c9b4790714e7afcc9c48a1a3a71764d3bd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS upload directories. These link farms are designed to redirect users to potentially malicious content, likely for phishing or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • 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.
  • 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://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/1f25474e1c5e547ffc7b0af879290cd7/raxisozezax.pdf In PDF document text
    • https://nieruchomoscikomercyjne.co/files/file/pisijig.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/fipemofur.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704dbcbd059---dolupenijatenege.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e305d6f90---42852254128.pdfIn PDF document text
    • http://htwy.com/upload/file/72514445624.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/2d5179089d5df90f9328cc568ac3d544/29283281101.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/sebowanagikawesuwokebupul.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/37326570191.pdfIn PDF document text
    • http://kistours.hu/userfiles/file/73840456888.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/2e71f4595e00fc4c47b92486a58f01e9/fuxudu.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/90525956437.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16121b7787adc4---58510398914.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/00a82858275719644da2c607cf2b3d2e/26172718438.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/51374550820.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/50732cd99133c9643b323db7a9b025e6/98819913910.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160aadb9fc8a58---32618977281.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/8c2657d6012bd37e3a91e085aaa9335d/81603563604.pdfIn PDF document text
    • http://veterani-pushkino.ru/userfiles/files/guxawibit.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/bidezulirikofagigar.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/caeb6aca2cfe8821de1b7c05a3b7b8ea/80137393315.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/222e5aa4bacdf907c3c47f5911c4315f/buzozitawu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=square+root+of+405+in+radical+formPDF 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_off0000c0d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E6 18512 bytes
SHA-256: 39683db28bc3702c38ee2d689e4990f89622030177a67376a2f46b1cb0f24ce1
font_02_sfnt_off0001078f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078F 11124 bytes
SHA-256: 7b6e91bded13f93da36f940886c7d8af7e8e5c2ea664c2345d52068ed694c994

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