Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d4b0641dbcc1b77…

MALICIOUS

PDF

80.8 KB Created: 2021-09-08 08:58:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6808ba38b60eeedd60417627b743e9c6 SHA-1: 9184fd7ed5c8ee321dbcaefdc4ab10dbe174cc79 SHA-256: 1d4b0641dbcc1b77192d7b446a98d35429500c08a8517e9b78893af85518e63e
164 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs hosted on compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics confirms the nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f90f021781e---54697175861.pdf In PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/ef939602380cedc35b99a3c3c398fec8/luwijerolowasifezadaxa.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/lukobagagezuruzasedu.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609699264a7df---lowebuzafela.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/77210364127.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/75391226517.pdfIn PDF document text
    • http://metapolar.hu/tmp/janazuforonefukabuwa.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bef51d1cbda---66969335574.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160876646cb92d---8295582409.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075fc7d8f58f---xokikosobo.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/28481905906.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d7935f2fab---lamasorubupavosinunaruj.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610eb933ce12d---36509501148.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/pufekije.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/37282018648.pdfIn PDF document text
    • http://jedwines.com/cmsCart//upload/file/18681904684.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/85514346609.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9790c904e---94358539902.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/zisutobazanosove.pdfIn PDF document text
    • http://www.bash.cl/media/file/25030149649.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/96509618009.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/piwagigubijadaxulevupoma.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b397a804444---76969542100.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cbc6500f8---wanikuv.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/fijakasisapolesodilazuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=pharmacognosy+varro+e+tyler+pdf+free+downloadPDF 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_off0000d334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD334 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4B 11240 bytes
SHA-256: 4978cb6d01902ea1c18295a2d19b337b1f86ac1b4d3e4ef6aacd0a1a3ed57c43
font_02_sfnt_off00010563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10563 18528 bytes
SHA-256: e840d2a1702a8450c87d8313903ba3070d808ea644d81c4c98a58b2854a9341c