Malicious PDF — malware analysis report

Static analysis result for SHA-256 b729e2e56eeefa1d…

MALICIOUS

PDF

95.5 KB Created: 2021-07-03 05:06:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0c2f88dbf4e54fc01423b7b62373a5c9 SHA-1: 95f96cdc2fbbadd6fd33535549c3515e006f1e8a SHA-256: b729e2e56eeefa1d7bf50900ab1608bd9258f77ddfc3c5fcae0f19496469946d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to compromised WordPress upload directories, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these external links. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://czdashan.cn/uploadfile/file/2021050110284673499.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/michcuplqjjtlructq1s1q74l9/90825635579.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/52ed6029147222b06c55c36ae6bfab11/36023704055.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5054e5d071458fd327db3b96356842a3/dudeg.pdf
    • https://widepolymers.com/userfiles/file/10549663317.pdf
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/bedosinubu.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/2445099284077f80a5bb8acfe3de7d0f/70343423840.pdf
    • http://amphorabeautyclub.com/campannas/file/15210263036.pdf
    • http://renknh.com/ckupload/files/gupezitojalidosumazerego.pdf
    • http://www.ecvbrass.ch/user/web/file/zoguzadiferabapizoxab.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/ef5a48e954ae8fdd1e532625c687d276/97255317306.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f594bb1030---jugazurupezedikut.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608253b7477a2---12813796396.pdf
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/5474562793.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/0abf9b5f9479f93804b9081a1a00a337/21733204519.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8c3fa322a83259a7402d9a39fb0a68ea/73489783883.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/74c637711ca07e0fde5be38561dc37f5/64650024948.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/mogmk3ukm4g7ood4rhjvu90ho1/tivadet.pdf
    • http://uctodane.cz/UserFiles/File/94632103006.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b12ebc6aa5a---towuwalejebezuvonapuga.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/57ed0a93258fa6e57c046962b3657a3f/mojixunuraxeviwexilezedav.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/5eeeb119738f1d7634242afcc7891f16/78935527999.pdf
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/sedituwepikexadut.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef228d96af---17550836027.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=interpersonal+connection+definition
    • 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_off00011288.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11288 16792 bytes
font_01_sfnt_off00012a9a.bin
918383b4841b5106f71aa151bc3c9a35e553f9270ef09994b281dd0d5a7d4c49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9A 17756 bytes
font_02_sfnt_off00015860.bin
be4d3f87be793d6fe41bb0178c4640742fa108d47fdc668fc6a3aa4e185b5f4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15860 10564 bytes

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