Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb2b8fd44d87c617…

MALICIOUS

PDF

118.5 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: 1b28833a56a34052091676005506b5f4 SHA-1: 873782619daf9a553116bcd3e8ce132e06ad43a0 SHA-256: bb2b8fd44d87c6176e34cf92d84ec3b6cb8ef9678bbb78a3bef43497629b51a8
156 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, containing numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to redirect users to malicious content. The presence of multiple links on disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 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://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off00016893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16893 11376 bytes
SHA-256: 9ec675025f43fa8480e7d7d121215925dc9b9735d64ced54f54b232172302b9a
font_01_sfnt_off00018350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18350 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019b62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B62 18520 bytes
SHA-256: 62ed5752b943af58b6d51cf6516d0c99b5b7e5bd21a180a0fbdc4c9786021db1