Malicious PDF — malware analysis report

Static analysis result for SHA-256 81167f61ed9e05de…

MALICIOUS

PDF

86.9 KB Created: 2021-07-21 09:00:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b11448444fd1c8ab5923a5947f705fdf SHA-1: ed33682d464c6e3adc2170fab7390e4189b03a4d SHA-256: 81167f61ed9e05de9b40f1d3835d84543d2a6b292bc521270ecdeed3d23a073a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable domains, a common technique for distributing phishing lures or malware. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/dq927eq2hehj308r5skgqirjpr/64112821715.pdf
    • http://sheeld.org/clients/d/d0/d021426cee8527c21a172be12ef3d645/File/72662672640.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb3d2c5b284---zewovirasaremukevixone.pdf
    • http://redfordunion70.com/clients/869360/File/narobokovixalenoba.pdf
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/7pu5apkt851h6idpr58ldjfu43/kekavowadumubidedes.pdf
    • http://prime42.ru/userfiles/files/83188767039.pdf
    • http://tragiaocolamsapa.com/userfiles/image/file/kaxupebiwagiguzibefenewi.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/2cnba2nepkrh88u1flksgh3jb7/jijefo.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/a4de199cf2165449b86942aa20521df3/22192300265.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39d049318d---82310029046.pdf
    • http://bukharajohnscreek.com/sites/default/files/file/muwaresotarefosizatodifen.pdf
    • http://intelekt.biz/uploads/pages/files/sinonuxonawatukimarenoxes.pdf
    • http://www.parinet.fi/tiedostot/files/jopijupekos.pdf
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/896f9315ca384271a04fe7f131fdccbc/45894742357.pdf
    • http://bawaconstructions.com/editorData/file/genidupim.pdf
    • http://pngroup.pl/ckfinder/userfiles/files/8714596026.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae76217e33b---4654520879.pdf
    • http://togetherwewalkny.org/clients/2/24/2411cc079aa0f0d7fd57f81c6163ecfd/File/nuvorowerukopon.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b985c0eac42---wuramofepilokivadusod.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858334d7f79---ribatimibosudoruzesukifo.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce5a466d101---70918531298.pdf
    • http://195exim.com/datas/files/rifulivarew.pdf
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/828b753259bd5ffb7f4f534f8188934f/sokisafiwilubojuwo.pdf
    • http://synowka.pl/galeria/file/vonanoluzir.pdf
    • https://acgroupenterprise.com/userfiles/file/43500756509.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/70656290b87e40b77bafd15e6cd95bfd/vokawe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=intrinsic+impedance+of+free+space+is+given+by
    • 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_off0000e92e.bin
9981746b82002c8144b0eafa2b7864b3d3d449d0d7ddb68de1097fd82fc38e53
pdf-font-stream PDF embedded font (sfnt) at offset 0xE92E 11188 bytes
font_01_sfnt_off000102fc.bin
cfd135fa9a4a4c79898a9392d6e97cd1e48f415c489b8c59808c80605276f3ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x102FC 19572 bytes
font_02_sfnt_off0001360c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1360C 16792 bytes