Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bf846fa415fabfe…

MALICIOUS

PDF

68.9 KB Created: 2021-09-25 06:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2e911b3b629fd02bb8404f5c4c102e01 SHA-1: c1c5879dd9fcebe68abe2fedbdd55bd93e79d01e SHA-256: 2bf846fa415fabfe19c5084c32ba44b38eaad65574c7c2618e73b0aaac7a05f0
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. The presence of numerous links on disposable hosting further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/4cb0574f7adfac357da4ebf2b6e08645/24072611409.pdf
    • http://robbymakka.com/userfiles/file/xasetuguzomamijoraxilapun.pdf
    • http://avtokit116.ru/!upload/files/memenemupip.pdf
    • http://imobiliariaimperio.com/files/files/kebonudisojefoxofolako.pdf
    • https://speak82.com/_UploadFile/Images/file/68989654865.pdf
    • http://mutitar.com/user_img/files/9491952610.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/161312e5c4c85d---vepuzadudupudow.pdf
    • http://hugslock.com/app/webroot/img/files/81809822107.pdf
    • http://gulfapex.com/uploads/file/60331255486.pdf
    • http://hyundai-baoloc.com/luutru/files/16665653140.pdf
    • http://35ct1.com/images/ckImageFiles/files/37266622079.pdf
    • http://canphantich.net/Images_upload/files/38663627581.pdf
    • http://vucert.vn/uploads/files/sezaz.pdf
    • http://htwy.com/upload/file/86724641259.pdf
    • http://rtm-plus.ru/ckfinder/userfiles/files/16652240373.pdf
    • https://xrtradingfeedback.com/cmsimages/file/46692906899.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b3a8ca854a---26018010191.pdf
    • https://austarpharma.com/upload/files/49652953934.pdf
    • https://himalayanthailand.com/image/upload/File/pusawexosuwiratotogunegug.pdf
    • http://tsraccountants.nl/mailing/images/photo/file/positojemileleri.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148a51959b3f---43059820068.pdf
    • https://noticky.net/akce/fotky/file/kanamugafenexifukap.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=real+flight+simulator+full+unlocked
    • 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_off0000adaa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADAA 16792 bytes
font_01_sfnt_off0000c5c1.bin
77f8ec16287f6ac9c008c6b467d10b9ef7d1f10e478f30155f06ad6616fcd842		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C1 11160 bytes
font_02_sfnt_off0000df72.bin
664ad87ffe6cb4ee914e94927fddea9582f057902a67f4e734c6b0415b89f2af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF72 15296 bytes

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