Malicious PDF — malware analysis report

Static analysis result for SHA-256 a17458c1a938b07b…

MALICIOUS

PDF

101.6 KB Created: 2021-09-06 14:08:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7918fa42de6b1455fa01382fc54a2e52 SHA-1: 439d3a790467f32dcf9be8f4581e264e4b533182 SHA-256: a17458c1a938b07b5e62adf91ed35f9c5f7ca4d24f237d30a0094bf3fe8fed8f
124 Risk Score

Malware Insights

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

The file is identified as a PDF containing a link farm, with numerous URLs pointing to potentially compromised or disposable hosting. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a malicious intent, likely to lure users to phishing sites or download further malware. No scripts were extracted from this sample, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4274

Heuristics 5

  • 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
  • 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://lacasedescaraibes.fr/file/61241270147.pdf In PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a6d0de01d---81619486139.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/98122305224.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/mexasazawakawedatulite.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/pibofu.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/guxakawobufixiw.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608705469b162---86548990243.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021080919232751885.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d460e66966---wonatolisug.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ad67123b372---jupuzolilusodowofinitiso.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/54686480284.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/j0q9j912nu1ogbmirssqkj4iua/rixexirobipatud.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d2f6f54e0c8---leluwolizifowebizo.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/1472be8c28c68de6c52fd7697022950d/73758501535.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/rewuked.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/9387e4daa0cdd8a5e424e6f656c5ed4e/kukevifozezofot.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/e4560a10981808f04b96262f5173dd81/jorogir.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/tkvpaluiu3i7i9j28uj1j2ck5n/zosaguna.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/jjjisan7p2m92hm26ob99dmn96/fesiwitifenawupusuga.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/13764553282.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607210b97b5db---nufetewewarisix.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/50295218511.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/f23554817ed3d5cb0d3a6ce11d68882b/40077109974.pdfIn PDF document text
    • https://faceless.me/userfiles/files/40426344154.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/74487443663.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/08708f640f8361fecf3bee5802a6d774/78180871211.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/g1m8nl9t4nofqtkovqdr1eqo79/82562216355.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=corbett+maths+cumulative+frequency+worksheetPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16893 11376 bytes
SHA-256: 9ec675025f43fa8480e7d7d121215925dc9b9735d64ced54f54b232172302b9a