Malicious PDF — malware analysis report

Static analysis result for SHA-256 2125c8eaf6b85e7a…

MALICIOUS

PDF

89.4 KB Created: 2021-08-20 08:05:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1f592677aa61b78ad90022827db45c31 SHA-1: 5582af8396124348b7cdc443568658adf3ad46f0 SHA-256: 2125c8eaf6b85e7aa8607bbd3675eadd84a2db3af80fca0326427e1c806e59f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous other PDF files hosted on various domains, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The structure suggests an attempt to obscure the final destination through multiple redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9850

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://flyingfish-stay.com/userfiles/file/31389580770.pdf
    • http://ulv-fogger.es/d/files/80093105754.pdf
    • https://aduanaldelvalle.com/userfiles/file/matevezepebotubajo.pdf
    • http://cutskytools.com/d/files/wogegumexugarobig.pdf
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/pqhj7ekp22jjae1vmf88cr3eoe/bonufoniwidopalij.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607203b2ec2e4---lujogiwivuzen.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/3fdd1400518b0d186055ef9145a29168/wagexukuwajomipimu.pdf
    • http://bancasemecanino.com/userfiles/files/93833600048.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/91rgnqmfsi2onvia8e9ghh9hm6/sitagozugax.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/oc5f8u5d5terbfdjbq5r6j0u14/nurafaxenojoz.pdf
    • http://alptw.com/images/files/25458652678.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad22edc233a---bemekatojagaba.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/4a73cd157c06d619be5c0c30cec183f7/medoxowadabotinar.pdf
    • http://riph.pl/userfiles/file/2461869075.pdf
    • http://obasekiestates.com/UserFiles/file/59191064396.pdf
    • http://tonioloclaudio.it/userfiles/files/kabudilewexukisixides.pdf
    • http://oroblupiscine.it/userfiles/files/dilupufikef.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4052ae6052---verisobapawol.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/4767d1074ae86373b3430b109d77ecfe/dagejaboxirukimaxu.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/c06fa3a842b1ec187f1fc93c7cdc34ab/50620511956.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086808853fde---44771466633.pdf
    • http://lycee-elm.org/userfiles/file/17227699294.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d394d06acdf---82748062798.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdd9f9d031---sanizemosisudilujakulener.pdf
    • https://turismo-galicia.es/ckfinder/userfiles/files/deditiwoto.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=the+barbarians+at+the+gate+pdf
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9b5.bin
e1e1396bae38bff076ca1863794b452caeb2a37fe8c6d199e48600e73b815e84		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B5 10716 bytes
font_01_sfnt_off0000f1d0.bin
fa1c929fa642cfcf0b0f43639b68849163276d5ac12b3a2745509c9e16db8afd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D0 16592 bytes
font_02_sfnt_off000108a6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108A6 16792 bytes
font_03_sfnt_off000120b8.bin
b073bb0a0a48e37f79945294694b63118b250e8cd0a0660efef77d2fcdf929e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120B8 16972 bytes
font_04_sfnt_off00014d74.bin
15171638d69c9281a983de8a04f8d213e5ed86d33053034f6aa0dd130c4010d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14D74 1700 bytes

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