Malicious PDF — malware analysis report

Static analysis result for SHA-256 8efc65b7b59d460a…

MALICIOUS

PDF

79.9 KB Created: 2021-09-20 00:15:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 335c0631ed930525e1a4b1dbfc6587a9 SHA-1: 1dce15961534cf873cd35168a665013738847ae2 SHA-256: 8efc65b7b59d460a1aeeee847232597b7696aaa3ed5c00ad340fbffeb0562e68
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. Heuristics indicate this is a link farm designed to redirect users, likely for phishing or malware delivery. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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
  • 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://pixomot.ru/uplcv?utm_term=fear+the+walking+dead+online+magyar PDF link annotation
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161328fcb43bc1---sarasa.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/jakijafarisa.pdfIn PDF document text
    • https://breedlife.com/upload/files/84184534310.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/jolewa.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/90234115719.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/63024265106.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zurokawopokininode.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/8294878003.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/20219537327707.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/memofiwa.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137371ed72a2---kiverejolexujafuwajaz.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/17440493710.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/96735134734.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/54c4a96d053c7589671b66266aaed913/32082243695.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/35582947029.pdfIn PDF document text
    • https://ysh.my/userfiles/file/41082495778.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/judugawesaxoman.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210902_003559.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210908234953.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/68664679507.pdfIn PDF document text
    • http://wieswioska.pl/userfiles/file/vufivu.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/72455003849.pdfIn PDF document text
    • https://specializzati.tecnaevolution.it/dataload/ckupload/gizenajologadi.pdfIn PDF document text
    • http://email-database.info/userfiles/file/mulerotubedusobebetajidu.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/161394292c5548---dezukubevipogukezaboz.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210909193016_rh85nm.pdfIn PDF document text
    • 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_off0000d602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD602 16768 bytes
SHA-256: bf87897ad889616be01ca37b446fc7dd7f8a016d0ea2eac6798c89eccb91362f
font_01_sfnt_off000101a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BD 10796 bytes
SHA-256: 57b15853c2d66f35a5ec85c914917b610d627ac331017f74203f95040c13b212

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