Malicious PDF — malware analysis report

Static analysis result for SHA-256 c35096ae3828fdc0…

MALICIOUS

PDF

84.3 KB Created: 2021-07-05 23:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c5c33c648761fcb07f7a4d2231e144b0 SHA-1: 40df0e859f027b6a85d16be260d68aec2d075425 SHA-256: c35096ae3828fdc0c6ede24e0dec68453d7a2f76ab6d31f58c1b182909a62947
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF document exhibits social engineering tactics, specifically a 'remote-support tool lure' and 'ClickFix' attack, instructing the user to install or run remote access software. The presence of numerous URLs, many pointing to compromised WordPress sites, suggests an attempt to host malicious payloads or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to facilitate unauthorized access or further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://ketchas.ru/uplcv?utm_term=windows+10+a+referral+was+returned+from+the+server
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a80ea561a04---18558722152.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/082fd54ed6eac419a22790e7ce547a9b/47797179358.pdf
    • http://cosmic-kino.ru/sadm_files/rafawavadujinulubovinos.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083bc0c04709---dosotukopejiwunalomi.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b5556e6ccb0---25653354209.pdf
    • https://mumegram.com/userfiles/file/vomigowoporonid.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/0r886vsqsngoq61828oiva1g0p/23988461971.pdf
    • http://hanasushimenifee.com/uploads/files/wirisonejorusolakid.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074d0dc6ab37---59063946907.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/qn61fvcn0hckacl8mm4rmagbg0/25592932982.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb73f24c83---54948943725.pdf
    • http://kagoshimakojintaxi.com/userfiles/file/nonolawuxowixoz.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160deeb0ead187---57897908247.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c738377d0ad---70002705635.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/65ba28ac5df598d017827e382d33d8c7/xusofoxumumur.pdf
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/dozitewomot.pdf
    • https://samarpanbharat.org/trila/userfiles/file/vaxodudetoxofitim.pdf
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/605b95abbae59f1170d7498915cbc295/wunoferafu.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dafcbf0327---vubidadanoxux.pdf
    • http://creptiles.dk/userfiles/file/rudukigunilipexamav.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb920072bb---gixebasekepi.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ee542d863---39573901513.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80eafa9e89---powasokoxoxe.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_off0000e145.bin
e8798e25b8efbcd9d07b99fa281521126c43ef26d5a1bb3878c10107582e3acb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE145 17832 bytes
font_01_sfnt_off00011022.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11022 16792 bytes
font_02_sfnt_off00012839.bin
8239475a582b56b362eded7d196145820ab2191777e4cb889558549a0e938e9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12839 11036 bytes

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