Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b2bd13b1fe18da…

MALICIOUS

PDF

71.2 KB Created: 2021-09-24 20:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7e1347984656aa6bed87490915ae1ac3 SHA-1: dfc894a2912adf7c11e7d23e4fd2645bd6748e9e SHA-256: 85b2bd13b1fe18da58a48420e7539bb25b41a337d0af655826c5cf6423f7264e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, indicating a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs are designed to lure users to these compromised sites, likely to download further malicious payloads or engage in phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee852d92c2---wuwuxolu.pdf In PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/eg52h6b7ldhe6kujoaem422k72/zuwiketewuvelizevu.pdfIn PDF document text
    • http://gns3.swiz.eu/files/editor/47893643967.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/xupemuvetaxuralapototo.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/51362543244.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333361d725f---75020967938.pdfIn PDF document text
    • http://vkp.ru/upload/global/file/80937322339.pdfIn PDF document text
    • https://tckontrola.hr/files/92794152474.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/digodifukanilusavegesugo.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/wonaxazisibujaf.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/14923680811.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/kuvefovi.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/saxufofirivarovabugupu.pdfIn PDF document text
    • http://veterina-naslunci.cz/userfiles/file/41897999260.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/86726537791.pdfIn PDF document text
    • http://ekvatorbl.com/userfiles/file/41374033560.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/32736033402.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/29035109282.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/rilizaleropurulemoguwamob.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/boej34rbim5er35kouk9tdiemf/midojeravufadonepes.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/colhju7jq5nbo5k6ao6dr5q1l6/75871641162.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/zuzexazegasukujilo.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614a09908ee88---17561465512.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///62362024357.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=project+android+phone+screen+on+laptopPDF 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_off0000b40a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB40A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1C 16536 bytes
SHA-256: ee70201424d5c0d07aaffcfb6ccb6f1335deef2b7527674534d7b353b64747fd
font_02_sfnt_off0000f62b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62B 10740 bytes
SHA-256: de4852720d0893762683b93797b82f930204663385591cdd6944cf694f5fc974

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