Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a6e2718a5f35ae3…

MALICIOUS

PDF

69.5 KB Created: 2021-05-03 13:27:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9da51be2bf9192433b48b787303bc0a5 SHA-1: 4d80a9e9ba9b9da126b0be907a049a8584f12199 SHA-256: 4a6e2718a5f35ae3452b2e7ce80236813797d85478759d2ef5b7af7475990545
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically a phishing or trojan delivery mechanism. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8239

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://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/a724cad7200bd78a43485358ce3cff44/78184167473.pdf
    • http://agcslohian.com/userfiles/file/fudatatisowu.pdf
    • https://alice-immo.com/userfiles/file/zepedapofatulepipalopefak.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160826605b8840---43106947087.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdbbe1d0bd---44991258454.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759b980e77e---zutaxorezupe.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/npp3vhd9gq1556prhqch358sr7/34683507235.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/i5e0og5r5tj5i2a7gsogedes6i/81168929278.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/9v7d0ce3h5bv6ffh51slib5gcr/sigefokefevowerojal.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16085236b13388---resipovavefiranosiwi.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608bdc0a0046c---dofabagetelofasetitixaf.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784525cb5fe---luwikufete.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160839a7bd8926---lowarofilebabev.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079a9f6d5506---pozaniratuveginevope.pdf
    • https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/lseik6c8khqoa2leee87joth9c/deruzowudofojaxuku.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=camaro+zl1+manual+review
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb92.bin
a36ea6db04b233e15eaf3fa2d5d5b7a1a103d5cc54bd936ad48a72b873b3d08e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB92 4812 bytes

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