Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bf2e17cd5e9dfd3…

MALICIOUS

PDF

80.3 KB Created: 2021-08-27 20:13:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ec2975db0f88349964af0bf09e6d2783 SHA-1: cc67b8f2faf64722163b5459f6b7cda392c8b2ba SHA-256: 6bf2e17cd5e9dfd356e4f359516c9b2e865b27a411c7aafb47ce0ac9106c5d31
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress installations and disposable domains, suggesting a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure of the PDF and its embedded URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://cructi.ru/uplcv?utm_term=collage+painting+with+paper PDF link annotation
    • https://hse.tw/upload/file/rakalazutixeda.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021062523435935034.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/53247765312.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/19249711392.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160989ca1e1473---gaziniperemevuxatevos.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a49593b0ded---gigosutobemirosanuz.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16078027ad86fc---fuzuwikiwopofisix.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/pr792o8ab0tv698dodifplpc27/pisoguwuxilukagusedulak.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/topuxinoruvigobopano.pdfIn PDF document text
    • https://condominiobrisasdelnorte.com/userfiles/file/30057716331.pdfIn PDF document text
    • http://suachuabaoduongmaynenkhi.com/img_quanganh/files/70379815009.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/23553017206.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f770cd00e95---sifete.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/wumurifiputodab.pdfIn PDF document text
    • http://www.smartlandgroup.com//ckfinder/userfiles/files/zagowogevabigugobajex.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/58293097714.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/64512110864.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202108131537124615.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/gedurexanize.pdfIn PDF document text
    • http://candientushinko.com/images/file/fivilakelarepiruduw.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/pebig.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/binarapoxolazijerus.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/90abf6ca9e7bbfea70836fc7536549cc/vabiwizegirokenaleviguf.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_off0000d724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD724 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3B 10480 bytes
SHA-256: e8cdd1e6bd76b6b8202a227ba8a16a1e84bd8c42844a79664863dd8ba189454a
font_02_sfnt_off0001070f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070F 16864 bytes
SHA-256: 1a56965c5f03061cc6dfc04790807f14b56e1b1ffc3a3679d64982f9e11b4429

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