Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9b1ff42762b6300…

MALICIOUS

PDF

90.2 KB Created: 2021-09-20 04:32:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ebbf05859e7891699027d7ba23293ff SHA-1: 10837bb3d3dc916ba0d34da179d81338e992949c SHA-256: a9b1ff42762b630014074316884116ea92116f9c5a4a432b348ec2901085c4e2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://smidgel.ru/uplcv?utm_term=best+websites+to+watch+movies+without+signing+up
    • https://alpinashop.rudy-ra.com/files/33697031462.pdf
    • http://aftckwt.com/uploads/file/movuzaponepiw.pdf
    • http://www.sec-ollivier-associes.fr/www/upload/file/95814380628.pdf
    • https://regionalhealthprogramsww.com/images/file/sisisibitapuned.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/fc5a1868685262bd1a9175fbbd3c3f9c/74324966063.pdf
    • http://garagehayashi.com/js/upload/files/maxebuvunupobavuta.pdf
    • https://avela.md/userfiles/file/15514774135.pdf
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/rabopap.pdf
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76467229497.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/d2c4d16492654b7bbf9e96ee72c96f05/58262821038.pdf
    • http://80tner.friend-match.com/upload/files/bububibimodoxupotuj.pdf
    • http://pogotowienaukowe.com/Upload/file/sexonixizoxesuxo.pdf
    • http://ajarnveerapong.com/UserFiles/file/pezuzazodoladusosa.pdf
    • http://partiaweb.com/upload/files/vubivofuletulukenal.pdf
    • http://npas.ru/pic/file/1229060419.pdf
    • http://theartofdesign.nl/ckfinder/userfiles/files/wivafabazasopo.pdf
    • http://obras.ru/sites/default/files/uploads/makawajofunisebeti.pdf
    • https://noddy.nu/images/file/wapugobujurawotub.pdf
    • http://dotbamboo.com/file_media/file_image/file/tedofekenel.pdf
    • https://allegypttours.net/userfiles/files/nazapopijosomokegida.pdf
    • http://thanuyentea.com/ckfinder/userfiles/files/88340888205.pdf
    • https://officialbacknumber.org/editor_up/77470221644.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16143c2150dd38---19390949939.pdf
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/89145466940.pdf
    • https://alariel.be/userfiles/file/mofokulovuvomanojukuvigid.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fab0.bin
b7126454aaa0fa6093b3baa873d9a3aa97554d946cc7c90dbf525dcf99586728
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB0 11120 bytes
font_01_sfnt_off0001146d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1146D 16792 bytes
font_02_sfnt_off00012c7f.bin
247adf26c93b935558f4c9374ebb09e3c43d32e89b21772eb863fcaef03a4a10
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7F 18008 bytes