Malicious PDF — malware analysis report

Static analysis result for SHA-256 316e14005be85bc8…

MALICIOUS

PDF

95.9 KB Created: 2021-06-27 16:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c72a5a4ada42417d4a55f397246c61a5 SHA-1: 3cbcf3769776634a28356b20f40ab16b946ec306 SHA-256: 316e14005be85bc8b9e59a9c2d73270887627b159290e3f3b710b1e2f3eaa493
156 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It functions as a link farm, directing users to multiple potentially compromised websites and disposable hosting domains. The primary attack pattern involves luring users to external sites, likely for phishing or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9768

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 https://ajwatravel.com/wheelmarine/userfiles/file/xaxobixepunonibu.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abec9edcb5f---51849489913.pdf
    • http://topenglish.sk/app/webroot/gallery/files/naxavoju.pdf
    • http://texmet.pl/userimages/file/soparikuvufe.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/k4lg32pfgutngqcd8atd25r55t/zuweb.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/tfqekfgro4uj99bfkkeqa957eu/57595943330.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f95bda8a35---susojupuneterajag.pdf
    • http://jjinline.org/file_upload/file/89832442026.pdf
    • http://smepil.com/ckeditor/userfiles/files/negixe.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/4d81fb1f3325d2c4655e3ac2cf61351a/98843589605.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160756a257e380---fefezujejig.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c000ec053a3---96317587638.pdf
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/d49d2aec17e17b2b35b5d286e484abfb/77116397601.pdf
    • http://curry-box-deluxe.de/userfiles/file/pubibazubupaluvagixitozi.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f20dfc62c4---32062802074.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/tijibafuvolesibitan.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/d2b2571v57k3bblmc473hpbca6/riwobogolosijori.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16081439ebe1b7---tuzevovipe.pdf
    • http://aldo-ins.com/userfiles/file/8104779521.pdf
    • https://anmimar.com/royal/userfiles/file/51850530496.pdf
    • https://penal-garazh.ru/files/56267240896.pdf
    • http://abnicum.com/files/file/80547268882.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/cc823f05d5f60145dbd90d71644d018b/68925988327.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1f67dbab6---wugusof.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/d646e445f0c5350e0a4208d7cacded06/97570519882.pdf
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/9pi742ncdfmr28vnj5qpsu04oa/34000808646.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=lamed+hebrew+meaning
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6e8.bin
b48a5a525f96cf9a4631d7a3b0bbb50fbb7b4113b2516f36329a769d4f0e6d58
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E8 19068 bytes
font_01_sfnt_off000116dc.bin
28b020f1940cae513e2a995ab5d1b0b40f7a0561d6d73cdb7d7d29b6a003c64f
pdf-font-stream PDF embedded font (sfnt) at offset 0x116DC 16924 bytes
font_02_sfnt_off000142ba.bin
ba2a3945426893f3d17127726624ce4da9a5306ce1b91a25210db3bd0c6d883e
pdf-font-stream PDF embedded font (sfnt) at offset 0x142BA 10448 bytes
font_03_sfnt_off000159f3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x159F3 16792 bytes