Malicious PDF — malware analysis report

Static analysis result for SHA-256 8218db6b2fc2bfeb…

MALICIOUS

PDF

83.0 KB Created: 2021-09-19 00:21:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4bb2c9a86d388f5b1f9f7c87b6dace22 SHA-1: bd1883b9cc1612e206606c3a1f34b3131f704d82 SHA-256: 8218db6b2fc2bfebf3f43ef43c9b8d33b9e075fe6d95c5435a39447d255f1f10
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS uploads, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is unreadable, but the presence of multiple external links and the heuristic firings point towards a phishing campaign aiming to redirect users to potentially malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://p-itos.net/admin/userfile/image/file/lapejogefukubob.pdf In PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/1auq2oq3afmrq3km6oo3hjpd43/68669244000.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/161334a4a98f97---36473551958.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/40562457439.pdfIn PDF document text
    • https://matraci.info/UserFiles/File/34672777679.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24818345048.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/79753862577.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/nurufoxukidap.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/fefikofeta.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/15215371811.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/pqo1g84401hjmpcs1gv5eboq43/dexebisisipeneraveru.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/f7f3d422cce85d9d965bd2f1f4b02779/26801345080.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e157d6041f---lufujiso.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/nokasizufanubu.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/45383008456.pdfIn PDF document text
    • https://marwaservicecenter.com/nbloom/fckuploads/file/pipexolukudogeva.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613987a600690---duwekalame.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614653d404eba---97974020080.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/50028335500.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/11351208671.pdfIn PDF document text
    • https://tgvl.in/uploads/fck/files/pewexujomalozibe.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/nuvedajufabag.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/susilix.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139068875681---45069352825.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=rios+app+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_off0000de19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE19 10276 bytes
SHA-256: 76180846ab0658f825b8a99d5a841feca2c3e20e3e3e1fc787ebd097916f1fb9
font_01_sfnt_off0000f55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55F 18000 bytes
SHA-256: f2154fc64a655faf28832b0488e5d1e05e96d9ba25d4d9af81eab869e53ff689
font_02_sfnt_off0001247f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1247F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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