Malicious PDF — malware analysis report

Static analysis result for SHA-256 768af77fcff4ce6f…

MALICIOUS

PDF

92.8 KB Created: 2021-08-11 21:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8cc8ff6397bc2c9ee9ec1d1247ac57cc SHA-1: ceee8d65b1e36c33e5db8f2bcb1bb6e3d3fd26ab SHA-256: 768af77fcff4ce6f0b4eb60c89050ee0b0764b114dcbb8be0d5ba9725e13dc9f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains a link farm pointing to various PDF files hosted on potentially compromised websites. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade initial security scanning. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://alibabaoman.com/basefile/alibabaomancom/files/866846217.pdf
    • https://dancleland.com/img/upload/file/labagesepuzozijozujofola.pdf
    • http://antifftech.com/uploadfile/file///2021053114435290.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/2850ecae0853e8fe347c0b8cc9c1df68/digazotakonek.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfb4cbc20e---92903083880.pdf
    • http://meble-tk.pl/userfiles/file/zirovarigozikek.pdf
    • http://charivne.info/images/file/93466988304.pdf
    • http://coffee33.ru/archive/file/89295290409.pdf
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/73156125861.pdf
    • http://daugiavanthienphuoc.com/media/ftp/file/noxawemur.pdf
    • http://insidethedigitaltrend.biz/userfiles/file/fawavimivezeka.pdf
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/jazekub.pdf
    • http://tribo.kz/userfiles/File/sanewujalevarosemosed.pdf
    • https://apc-algercentre.dz/ckfinder/userfiles/files/bapafed.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094068292e6a---61920071376.pdf
    • http://sungsam.net/userData/board/file/mudijuga.pdf
    • http://elosc.com/upFile/file///ITX202107231649428143.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/1ec8f461383821de445dc1e1b9e3284a/15924192167.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/a8af76f5e6494ae0a15d7a294a0e209e/86214893128.pdf
    • http://alda.pl/ckfinder/userfiles/files/feluwuwagufijovowom.pdf
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/58edfa643b81da606edd6aac97825d0b/rosoxukufito.pdf
    • http://nuestratierrapremios.com/campannas/file/23305968545.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608512feb2dda---sidizovuva.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16072c7a290804---86543610253.pdf
    • https://bangprice.combangprice.com/beta/cms_image/file/4254822186.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d76403e1f8---45640485466.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=convertir+pdf+scann%C3%A9+en+word+modifiable+en+ligne+gratuit
    • 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_off0000fbf8.bin
9d3a778685a5754679fc78d7f692a0b573bfccae2f8e022c2bf4ec25c0c52fe3
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF8 19872 bytes
font_01_sfnt_off00012e29.bin
5e1432954f5130a8909c99443e0970686fcf0d0e3d99f648fee9ae811d6eca4a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E29 11540 bytes
font_02_sfnt_off000148ea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x148EA 16792 bytes