Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fabe4dda4daf880…

MALICIOUS

PDF

83.5 KB Created: 2021-08-25 03:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 532c9619919d410160a96b35b1901344 SHA-1: 8224271c54becb966c6e808193cfa34f48e28539 SHA-256: 8fabe4dda4daf880702a4fd6e38ab3ee539c7cd0d61f96a1250e0c6c3cc85e1d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The file also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised websites, suggesting an attempt to obscure the final malicious destination. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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 http://synagoge-stommeln.de/ckfinder/userfiles/files/36101979990.pdf In PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/34507645793.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/48e8dfed80ddc3325a18f6f629cbb72f/nunazoj.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/notizitexolubokawokilufi.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/24754839666.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/b7723a43beffee70a8d94fc75fb62875/riwosibukulixitumavidu.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/tavuz.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076c57b562bc---39530734709.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/01303c601f7d9a0c9b70b11fbf060ebd/61525442010.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/zogegimagobukukarow.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d634b1115d6---pisodukezopibe.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa0e3b37938---51208119460.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/c61nlg9feantqkgsh7hd9lhjgp/12210055389.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8c8df2f89---49228274641.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/42853570823.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ee7dc3076c5---daxaxupudene.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/72983355656.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-06-01/images/files/dozixinidekomuzerowanajut.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/ee89c34a633e0438ebafd9660dc5f580/65391406066.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/padevobasikaj.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/17875631463.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d784c325004---gesijotikiv.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/76157386211.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed7a575c600---rekebegojela.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/21082008092566595008ikg0.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/4602cb1b38f7430f1c67602b0779f9ff/tinewefasukafiwadiraxut.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6577903c7---22883263569.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=best+app+for+converting+jpg+to+pdfPDF 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_off0000e287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE287 11000 bytes
SHA-256: 2ce601815351ac8f9103cbc0a20ebb0c7494588f0cad589dbb0bb0f27309e9bf
font_01_sfnt_off0000fc0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0E 16636 bytes
SHA-256: 580bccbf5c964123f60abb892a1891742b6fc4f3a8470bd6f7a55b1f75846962
font_02_sfnt_off0001278e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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