Malicious PDF — malware analysis report

Static analysis result for SHA-256 768edef9b198c3f6…

MALICIOUS

PDF

81.3 KB Created: 2021-09-11 19:02:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cfe349061fb44eb373e25431abe22d71 SHA-1: 9fd94fe199ae07f5ee6f0c012015f640a052d600 SHA-256: 768edef9b198c3f6df3f2bf5307f926312efc975dcb0d22f7b1ec955205e1a3f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains embedded JavaScript and a large number of external links, many of which point to disposable hosting or compromised WordPress upload directories, suggesting a phishing or malware distribution lure. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites or to exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://skiclubraonbaccarat.fr/pdf/47425942648.pdf
    • http://wangguanhardware.com/userfiles/file/72474983969.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/7953fceb33e4d1ac0d68d8e9e979faea/45840844793.pdf
    • http://kebirbeton.com/userfiles/file/bepofoxebegap.pdf
    • http://mgtofubbq.com/uploads/files/50602930874.pdf
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/90451283007.pdf
    • http://www.cenlafilm.com/siteuploads/editorimg/file/2865888883.pdf
    • http://youzedu.com/ckimages/files/20210903015105175942.pdf
    • http://duythuc-bearing.vn/uploads/userfiles/file/32471593184.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/faaba1e58af167a77a3347f15bf6f22c/89048493685.pdf
    • http://cermak-expo.cz/data/files/file/84640254015.pdf
    • https://fresh-cherries.com/ckfinder/userfiles/files/75950297124.pdf
    • http://autostyle-japan.com/js/upload/files/sutamagiworojubunib.pdf
    • https://kit-veron.my/ckfinder/userfiles/files/vidafevuzuxasizokopebu.pdf
    • http://dreesmann-foto.de/userfiles/file/3861195319.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7c7ccd622---77574005399.pdf
    • https://indiantalentjunction.com/milan/media/silevevanejirewijodapusi.pdf
    • http://drigungkagyurinchenpalbarling.org/upload/userfiles/files/xonawukukeke.pdf
    • http://margheritango.it/userfiles/file/gonudulezapiwosanov.pdf
    • http://www.jasfec.com/imgs/uploads/5340608088.pdf
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/mazekawuzeroze.pdf
    • https://mb-classic-service.de/userfiles/file/lukuduxopijup.pdf
    • https://isleo.com/i_photos/file/393146512.pdf
    • http://blackivy.pl/userfiles/file/jajosusaseleborepav.pdf
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/35879111791.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=gta+rp+mobile+apk
    • 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_off0000da49.bin
00ec603e0e7dcd7d517ac1b3905012c7feff0bcd08b30678b8cd20b46c1c566e
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA49 17716 bytes
font_01_sfnt_off00010891.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10891 16792 bytes
font_02_sfnt_off000120a8.bin
a1a46e235753263c45d5d5670e77fe8aba8ddcd2e1b52e407fed83646e14d4b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x120A8 10412 bytes