Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d788be33ebd5b10…

MALICIOUS

PDF

81.4 KB Created: 2021-07-01 16:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d9fe051ce5b56d41d28b410bb4770cc8 SHA-1: b1e8d817afa9ea7824411f6914f10aa4ee89b028 SHA-256: 1d788be33ebd5b106f44ae39ce70de7dbd5b403a0edba3956635630292b244fc
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links to compromised websites, suggesting it functions as a link farm to distribute phishing content or malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs point towards a coordinated effort to redirect users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/p49266297p742p2sakle5vtg50/49550086233.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/s98j7b358ftptut94v6hbnfptk/gigiliromozipojabe.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078b9e8438ca---26113281143.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070cee12a343---30402100713.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5eb2577b2---gapefesepujaro.pdf
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/xuwaxadofuxuluzinoga.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/1436ae1ebbeffb136506e34b66dc5e87/54206287328.pdf
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/tumimalunugojibogegemib.pdf
    • http://baggiez.net/userfiles/file/jabuvisol.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/d9fe3ca6adf0cec24ac15439774cab58/71776782180.pdf
    • http://vds-construct.pl/userfiles/file/32234034410.pdf
    • http://acecaalcoy.com/userfiles/file/91723251713.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd04bc97917---sokakipizu.pdf
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/5b4f1ab41d163190296242aa9dfd42b4/sijiwulagufeku.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6f9eab8eb---wilanefipomudukoz.pdf
    • http://ohsclassof73.com/clients/9/9a/9a21b0b253f7c4eafe662346d237c286/File/lewomujopifumasixedizibef.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928ec4e673d---80408042059.pdf
    • http://tv-sat.cz/userfiles/file/64819639718.pdf
    • http://hphs1958reunion.com/clients/47465/File/64484382576.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da9a02a91f6---bixujageje.pdf
    • http://boothbayharborshipyard.com/userfiles/file/92594694110.pdf
    • http://farmaciafoglia.eu/userfiles/files/xutaxituxopomusidavizav.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/df8bc9dc39243739f0a98d11a0a4f782/16097192884.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=5+ft+7+in+inches
    • 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_off0000dd61.bin
4281a5ced5cb9cdd624127184d38c4278c42594118b923b4ad554e6891667a71
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD61 17080 bytes
font_01_sfnt_off00010a2b.bin
d031da51b306913aeeeeba88906017f83a09d61a7fc67f3dceee2b7aaa1d6a79
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2B 10092 bytes
font_02_sfnt_off000120a7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x120A7 16792 bytes