Malicious PDF — malware analysis report

Static analysis result for SHA-256 b52939202e3c3ef1…

MALICIOUS

PDF

81.8 KB Created: 2021-08-03 04:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 8b9fef7d3b82db88fb18875d626c80d9 SHA-1: 344b759b4676a3f9be5eb39b39a97d8b301b47de SHA-256: b52939202e3c3ef19fffd3a228bb3ce6fc57f4b327314f3f8c45a78a2851093d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. The presence of numerous links to potentially compromised WordPress upload directories and the overall structure suggest a deliberate attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7760

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 http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/7ae6a9f37a2a7bf06688c21769f6002d/49061148580.pdf In PDF document text
    • http://vendsol.com/userfiles/file/juson.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/41745988993.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/jizibafulu.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/5e779e3ad243cabd53c13977cc172d7a/33596877429.pdfIn PDF document text
    • http://wamer.org/userfiles/file/wawolizejimozilabidaf.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c2b9bfe25---7605639748.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/niwojukaxodubiworenepez.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/35162238167.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b255d473c40---devimozijefigip.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/42522349908.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/605343181d3939645f8b46acbfa62564/lewudawitarazebolexuz.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/01fd1rbnigp2p7arso9avjh0o4/jegidilu.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa073b58cdb---xojejejuvejunifuro.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/zadisodolotedidarib.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/5c11f1a60ece7ed1fce312e151b4bab4/rakizileguteximiv.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/045cfa3442a2c10cad9e0242bf92f040/fazijekaruxiwizixowomil.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97876276617.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/60750b6a3f63a70cba24337f8f703551/27633953162.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/5570495207.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c56dee7a77a---wukirubopuk.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609214b3ac540---lanemiwakotipewesa.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/lusirorexegidakafiwanid.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160902661bfd91---14475581480.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0f4245ea9---ribomokovonopuvajunaten.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+get+the+chosen+app+on+fire+stickPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10632 10884 bytes
SHA-256: 98df0571f7f704a101e7bcb57b3971bacde1478914d8c9bc4f06ccb0066fc737
font_02_sfnt_off00011f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5F 17624 bytes
SHA-256: a6810ef17dff49b78e3547a17d1fde1bc2eb10f38df3d8277a08901cb7ef4cbb