Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdf414a7bd4f1f6d…

MALICIOUS

PDF

82.8 KB Created: 2021-09-07 04:30:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: c294c959c16504ad9fd757fa3de93f12 SHA-1: 1235d03a85e4d8be03e9d21cb662a56dd85315c3 SHA-256: fdf414a7bd4f1f6daacb5418806ccf1797e983c2c9f1a864de4686afca43a232
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, likely intended to redirect users to phishing sites or download further malware. The presence of these links and the overall structure suggest a phishing or credential harvesting attack, potentially delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://philabc.ru/uplcv?utm_term=sas+business+intelligence+tutorial+pdf PDF link annotation
    • http://phdpecs.hu/userfiles/files/33006093938.pdfIn PDF document text
    • http://fthyhs.com/resource/docContentImg/file/2021-08-17/426f292675107e9f7aabc1313bd09e7c.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/18603235225.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/rimemejelagivekaxusedilu.pdfIn PDF document text
    • http://plncse.hu/php_data/file/39305999328.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/vuludeve.pdfIn PDF document text
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/wiguzaji.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c597ae68e---65086949828.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/14574136.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/riruwosedojatizod.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/sotuposewuwusolutofilumu.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/lijujudefugotedim.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160afdb0eb9ab9---razodozokovojisowu.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/lebatatefefuzomobujoga.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/ce0ac98be3d630a5b1e4f911e4cb5a3b/goweva.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/47398547431.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/76198327161.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c27e0b3c77a---fakidajutesasigav.pdfIn PDF document text
    • https://davnosti.ru/upload/5310628119.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/40049336056.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/27889463071.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/3344e36df5ce34608a032281a3249e8e/29800671154.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/80235254488.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/rebewedigonefamesuga.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/99417361881.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_off0000ddda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EC 17916 bytes
SHA-256: 009e0a6ba722fc81e325f57a6d21f124a8c571b65eb9320952eda81cb73a9823
font_02_sfnt_off0001240e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240E 11108 bytes
SHA-256: aa45859d022713fb0bda72b162eeb3a00d219bf0fdf67081dc273d31525a7c2b

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