Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1b72ad580f811c8…

MALICIOUS

PDF

72.7 KB Created: 2021-09-26 07:13:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4f222a23b677a178e71d56d528476e1b SHA-1: 9f199104939148e0a80f112b559dff9bc1f678fb SHA-256: f1b72ad580f811c8cd31b36e93ed8744680010d82921b8f6ed17040443c96392
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms, as indicated by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, limiting the analysis to the URL-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://rarahil.org.np/ckfinder/userfiles/files/panivuzixu.pdf In PDF document text
    • https://tradingphrases.com/userfiles/files/13069920929.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/wemena.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/kalaben.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/suzeragenerigifog.pdfIn PDF document text
    • http://weldingplaza.com/files/file/12264950457.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/15649305692.pdfIn PDF document text
    • http://www.77ice.com/upload/files/3917398963.pdfIn PDF document text
    • http://020tzs.com/baige/images/userfiles/file/laxagifewogapawofebeg.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b426362bd337bbae28dbd5e627a424ce/59436901620.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/boguwowudog.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/38133252425.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/96890185301.pdfIn PDF document text
    • https://gangnampools.com/contents/files/1347094533.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/87311722855.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/2021911109142487.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/e6da0a03583ad05531a07fae6217e9e9/kozoduwuv.pdfIn PDF document text
    • https://gsc-tw.com/userfiles/file/44301614587.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/ridobuzizaxog.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16135ef7629dad---runixiremogebifilidudoxu.pdfIn PDF document text
    • https://soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/46052164076.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613777b629447---zenonusejodunisorawu.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/lojurasaguvoregi.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/gufawi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=metal+slug+x+apk+free+downloadPDF link annotation
    • http://elezioni2014.gds.it/userfiles/file/totizobekadelewalireva.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_off0000b5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5C0 10952 bytes
SHA-256: b2c8c254b58fee0deff7d5179a2e9c415ccf8bcee0271da02be595cd723246a8
font_01_sfnt_off0000cf37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF37 17944 bytes
SHA-256: e21071eaeb3f3cbcb92bec2a74e4c32f03101d684026dc41f3ef94f96b0cffc7
font_02_sfnt_off0000fceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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