Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbf826434fa9436a…

MALICIOUS

PDF

179.0 KB Created: 2021-07-19 04:07:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fe0d395657186eaea56eeeac46a79c18 SHA-1: c622942d551c6374bbdb4008f65bfa9fc822e576 SHA-256: fbf826434fa9436a22f62e5cd5daec086f4f4d0aa8c18a24d9c48172845337dc
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9687

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://ih-consultant.com/ckfinder/userfiles/files/sowebuke.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989667965af---puziruliziketugolek.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/pbebii9o6p9ihkmb1t4cqh1kau/24312177458.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3145dc852e---loterupixuposobajafula.pdf
    • https://artbynela.com/uploads/file/46251058347.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/b40be7644dc04f280cdfa395f8dac1d7/60315652689.pdf
    • http://st-ark.it/userfiles/files/26310537962.pdf
    • http://sam-global.info/files/file/41246050182.pdf
    • http://hoaisonland.vn/upload/files/gulupo.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609fef3f19fc7---88379509225.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/76dfe09ef484e9997097675270a6aa5b/miwajos.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/6ae7d4a8d012f889b75d8fe32485798c/josopotugitax.pdf
    • http://axiomestates.com/userfiles/file/manuxezinotu.pdf
    • https://khotelmarket.com/FileData/ckfinder/files/20210603_F32E4D650E12320F.pdf
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/xerizigenomud.pdf
    • https://sasalidayanisma.org/uploads/file/940277961.pdf
    • https://cncostruzioni.com/userfiles/file/lizirepaxe.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4904c3bf9---dalomuvotupotajeruzuxedi.pdf
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/tasojexanamibefari.pdf
    • http://virtualcharityevents.com/vce_cake/files/files/90271635394.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816c5724918---64001437928.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47ca5a3b7c---gonosowatukenupezutex.pdf
    • https://avigailpekelman.com/sites/default/files/file/talokereribojokaxunobum.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/fa143b5e01ab67bf0777e61ed3ddc139/wukeseputepurilifa.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/85bc8ed57aadbc01ff31b250bb580e7c/20323923517.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608f016c0cbea---mexazaxapuguzesugag.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=martin+kove+once+upon+a+time+in+hollywood
    • 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_off0002562f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x2562F 16792 bytes
font_01_sfnt_off00026e41.bin
0c9a705ed202640b334b5b6d1be2d990d8a26e19e2e818c9f02c3f34fbd144c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x26E41 20784 bytes
font_02_sfnt_off0002a2b6.bin
c222e0ecaa71b973759ef8ce65683b1f6967f851ec080e8152be013461517e9e
pdf-font-stream PDF embedded font (sfnt) at offset 0x2A2B6 11060 bytes