Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6ff5195b6ac7391…

MALICIOUS

PDF

80.6 KB Created: 2021-09-20 21:44:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c712e5c2039b36f67fd4ed40a29938bc SHA-1: 38f11911e974a065ff463f915e20527a9d43db5f SHA-256: c6ff5195b6ac73910f456b0a7982ec095b85e43d5524c72cc1dbbf18c95ebdbb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, including one pointing to a compromised WordPress upload, suggesting it's part of a link farm designed to redirect users to potentially harmful content. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme.

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://appvid.eus/userfiles/files/pujofokogirepabesubixa.pdf In PDF document text
    • http://lerucherdesanges.fr/userfiles/file/nakigasisejimowabadoke.pdfIn PDF document text
    • http://cascad-trans.ru/files/rodidub.pdfIn PDF document text
    • https://patc.fr/imagesfile/38488964199.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/13195397721.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/5299148209.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/vutaterumesewuku.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/93801483119.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/51decfd0cfd4200c450c5d9d5cebc2a9/tomonavupuzexalowulane.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/jinoresazinelonufuj.pdfIn PDF document text
    • http://xinge168.com/uploads/files/20210906031350_812632.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fdc840944---20525152401.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/161407fc5e3d34---rafelokuvefujuvijek.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/wogosaxene.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/wavobepixepogez.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148a02799636---zesur.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/zukuvisaxe.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/4598362451.pdfIn PDF document text
    • https://havilahbuilders.com/userfiles/file/57893679052.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/soperizelopepiwexalol.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/zolunuxugapagid.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/27191527956.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/temuwefunalemufunesodeju.pdfIn PDF document text
    • http://vakaruinzinerija.lt/userfiles/file/diduvam.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/47740187942.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/71106216454.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=movie+zero+apk+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_off0000d6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D9 17984 bytes
SHA-256: e9df25f09abae339c28c1e364848fbc6069ac0bbce4d95bc550e2aa0864acd15
font_01_sfnt_off0001053c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053C 10416 bytes
SHA-256: d8dbb31949c6bb8a20cd32cb1498499ef6cde47976b85e053428faacab3d6747
font_02_sfnt_off00011cfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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