Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa8fff75119c913b…

MALICIOUS

PDF

85.9 KB Created: 2021-07-06 04:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f81d009664f621655b44d65504a1b06e SHA-1: 839107f66f33a0ce7d7e566ff96d42cef7663428 SHA-256: fa8fff75119c913b8cb76028e7cb6d47f2784c1380da9cc8c19beb795104cf5d
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan. It contains numerous embedded URLs that form a link farm, with many pointing to compromised WordPress upload directories. The presence of these links suggests an attempt to lure users to external sites, likely for phishing or to download further malicious content. No scripts were extracted, but the overall structure and heuristic firings indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3778

Heuristics 5

  • 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
  • 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://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/c5eae8dca9dd2f8795103605e40bcd01/89284472066.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/a6c4182023b4393e5424480ba3312112/21701205789.pdf
    • http://tfh-filter.hu/_user/file/32088103708.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffea962c36---somovezuvus.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4edc5543a---61497936863.pdf
    • http://robinsonsmithreunion.com/clients/879094/File/24280837580.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609422bfda2a3---kijazedesepatefiwuxi.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/5df638f38ea6fed5e0a115d1e6cfa589/vibafodudivopikemolesigas.pdf
    • https://lee-trading.tw/archive/upload/files/rosikelujukajavimuto.pdf
    • https://eltonltd.ru/sites/default/files/uploads/sujomidapadotopatotowoku.pdf
    • http://masan315.net/board/imagefile/file/27291441365.pdf
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/312f07b8427661d3f2fc561ee671a9e9/pijakojademozizis.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160cc87f2af7aa---piwabezisufegivabela.pdf
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/282ecde2613ab8d15c77a173df117a0d/52731069500.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871d17c8f37---7672433563.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/qho8415k5mcl67lqq1ft510kk4/poxibuligepon.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ac906c751f3---3494096189.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16072be192c884---76892864819.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/9cmi8a36ebhvemij0otjnouq2g/54452834301.pdf
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/rdjmrj2kblmtbsa0b9au701c1t/20346004356.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82ad4bf672---didakomepokovavalotoso.pdf
    • https://xo-sound.ru/userfiles/file/gamemedefaregudunebadig.pdf
    • http://jhdljz.com/userfiles/file/1625420668.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099961aa7321---gibifurunuzek.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=paco2+normal+value
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b19.bin
620b0560f6e59c37112642f90f0c317728b70dced23c5b6c5256a5f7ac55baff
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B19 17508 bytes
font_01_sfnt_off000138cc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x138CC 16792 bytes