Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec2dbd273027611c…

MALICIOUS

PDF

108.0 KB Created: 2021-07-30 22:42:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f92d4557f15e3c13d149583c07e76d97 SHA-1: 614fb57313c1501b5122fd6a3f0a3f437cccb7d1 SHA-256: ec2dbd273027611c94b56df781d7bac5afb24cd28df2eb040d85bb4c20d7992b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress uploads and other disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://spherule.org/wp-content/plugins/super-forms/uploads/php/files/64ec2d5805ad944cbf78cacea56cb3ca/bibugezanozi.pdf
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/1078864604.pdf
    • https://arte-salon.ru/upload_picture/nelaxefuvebigoralipanov.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095bf21be626---18519493525.pdf
    • https://wfca-czech.cz/temp/userfiles/files/divaxidamoli.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c362b21780f---vibivakomerikov.pdf
    • https://smartcirclegroup.com/userfiles/file/toxakaf.pdf
    • https://almuhja.com/ckfinder/userfiles/files/fameribufamefijivuwojo.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16097778672ab4---gutuz.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de1e729bd07---gosebeporujesi.pdf
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/vezujidiziravoxovovoned.pdf
    • https://n-zvuk.ru/upload/file/85503628552.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/0b92c8b12eca92712904e77d8113d309/lidosabi.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160746e1f61943---tekalevugozisuduwabobit.pdf
    • http://flirtproducties.nl/ckfinder/userfiles/files/17978469496.pdf
    • http://jar-ted.pl/file/56648413281.pdf
    • http://crystalsteakandstogie.com/clients/1/1d/1dbb6d5698303b6304ae84622e226a19/File/490809200.pdf
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/67827632975.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a26649b0531---nebux.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/7c5f4e8adc870597750137f9db308328/30639539523.pdf
    • http://softtox.com/new/userfiles/file/60587992556.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c71683e1c9---lixagofakisepuwalalur.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/b9e9e9906d97c1a0864841b16c13220b/kekewujafawipitefilifog.pdf
    • http://huefpdf.org/upload/file/xaxig.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/7909bcef7b539225db0cde4bd4df6ebe/67319511904.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=logstash.outputs.elasticsearch+using+mapping+template+from+path%3D+nil
    • 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_off000103fc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x103FC 16792 bytes
font_01_sfnt_off00011c0a.bin
008d76863d27dd0bebe05998a96052974c59df6bff7040c8d4e2dc5f235a61ce
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0A 19216 bytes
font_02_sfnt_off000156d3.bin
4478d616839c6e10aa965cc1f1db35b4d9b5cffe572f7deb76205f3fb0210e67
pdf-font-stream PDF embedded font (sfnt) at offset 0x156D3 18128 bytes
font_03_sfnt_off000186f9.bin
ec4702fa26371d2975325e66b4b26207c69a1ad1063e9066b37bdc04b42fa747
pdf-font-stream PDF embedded font (sfnt) at offset 0x186F9 11096 bytes