Malicious PDF — malware analysis report

Static analysis result for SHA-256 50feb66880058342…

MALICIOUS

PDF

85.1 KB Created: 2021-07-04 22:16:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ab46139acc271dd38e2cc34a4394d76c SHA-1: 9f90055a6b8820e7a4cd1b7d61675f9ed232f1e7 SHA-256: 50feb6688005834254aa5e3160ec423d88c31c6b6eddb4c786dee38f6794b0ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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://intergeored.com/upload/File/61639406644.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160743d904576f---65997807690.pdf
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/5108064720.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/183ee36faa7ac65bf901d16069b3f032/roguziniruxikajava.pdf
    • http://aelma.com/sites/default/userfiles/file/14465778582.pdf
    • http://hydrem.ru/images/file/gejub.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e0300df7c---62227284665.pdf
    • http://goksirlambinowice.pl/img/upload/files/89219526203.pdf
    • http://schmetterlingsgaerten.de/file/xeroxuwoki.pdf
    • https://aventura-agence.lu/userfiles/files/pikasejesolo.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/fve37h4i4ccrcou1sodqjk34lm/5416718195.pdf
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/72238881544.pdf
    • http://lg-palette.com/upload/files/12587623511.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/25439ff3b895cd44e81818300ea0b465/77700245675.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4cdadbce25---26360275912.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16086225dab470---76511740112.pdf
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/vigajiboxo.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d3b560df5---45239370930.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca0cdd92d8---93027627656.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/b539b00516ea45b6b39c71754ea54579/86941730842.pdf
    • http://project-lovcen.me/userfiles/file/9230273303.pdf
    • http://alliance-ic.ru/uploads/file/7939565736.pdf
    • http://s-privod.ru/userfiles/file/kegalowemozenupudid.pdf
    • http://dabaizhongxue.com/upload_fck/file/2021-5-18/20210518021938771364.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/eced5422ac7425075e12a941b4af9d29/judizapilirodizozamol.pdf
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/62544737955.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=zap+remote+outlet+switch+manual
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf4b.bin
95e0bec13aa2ecfec22820ae5982b60f7e2264747ce45d2e82c8eb394860a5c3
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4B 17724 bytes
font_01_sfnt_off0000fe3f.bin
358d0a74dd68b3dd85a5924d8feaeef15911bde6f606d20f086df8e87770ca3d
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3F 10788 bytes
font_02_sfnt_off00011708.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11708 16792 bytes
font_03_sfnt_off00012f19.bin
dc06733fb1b3e8baa4303a7b234726769048d67753183ec25fed266cd0fe6b8d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F19 16224 bytes