Malicious PDF — malware analysis report

Static analysis result for SHA-256 f00b7117286dd53b…

MALICIOUS

PDF

91.1 KB Created: 2021-07-23 21:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 8251bbe10bb8e8621f5a7c00ff43dab9 SHA-1: dea8701f2c364483adb57734bbe5e0900ed52078 SHA-256: f00b7117286dd53bba848b9056e29ec8eb1d15942a76c88cca4ae4dfa38cee8c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to compromised WordPress upload directories or are hosted on disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware delivery mechanism, potentially leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://xehowo24h.com/images/ckeditor/files/baribesuwuxu.pdf In PDF document text
    • https://osikovo.eu/webroot/img/content/files/41730687667.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/83983763822.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/vuxetazisufivopuweseluvig.pdfIn PDF document text
    • https://eslms.com/userfiles/file/dekeworis.pdfIn PDF document text
    • http://tano-cable.com/d/files/basogikoluwiwijikam.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873a2cdad69---56746084126.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfffae1a32---genugitivusapivexijapulu.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/c848756cf5b882cc94a6cc369de646b2/65524681625.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/p99ini6s3p07qdp6t11ldhcbf7/23078983040.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/19148185435.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/18154990000.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/95329001222.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba42428af8c---10518487052.pdfIn PDF document text
    • http://burrburroughsfamily.com/clients/55468/File/83765738695.pdfIn PDF document text
    • https://cebrigantina.com/025-CEB/images-editor/file/bobisokofato.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebf0aa3e26---41458032579.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/85510330883.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/19422303312.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae86ebc99c---zufarijijoxowovor.pdfIn PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/33869590169.pdfIn PDF document text
    • http://phongkhamducphuc.net/images/files/fofixigoma.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/72df1e11380ae2db85d9544f8fb8c2bf/80697159325.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/b3a9c7ef36e7f9d5377c5916e683eb6d/55582406826.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/30278322672.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=concept+definition+map+renaissance+answer+keyPDF 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_off0000ffa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000117bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BC 11056 bytes
SHA-256: b49a55ec32b7ac8c747a00668b5c3cf0d2bcbe5f5f45282c60afad553cc338f0
font_02_sfnt_off00013199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13199 16948 bytes
SHA-256: 52a1a237be4bae2e959c885ef9b4d65f8b5f22f2f1e5786e3103d8e49fe3ba9c

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