Malicious PDF — malware analysis report

Static analysis result for SHA-256 25e2824c1929b7ed…

MALICIOUS

PDF

77.0 KB Created: 2021-10-04 20:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 90e0b9c0d4838f4c816b1e17cc47070c SHA-1: 525aecb4c747396bd7d0ebb878ee47ba2e95e99c SHA-256: 25e2824c1929b7ed4df048459efe077fa4c0a6b4ca34a8cc77e69c4ae71a4d0f
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 CMS uploads or disposable hosting, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO manipulation. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific user-facing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://domosplast.hu/files/file/82797000130.pdf In PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/96569454991.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613574beec269---57797779241.pdfIn PDF document text
    • http://supragyn.cz/userfiles/file/73632825673.pdfIn PDF document text
    • http://chinahongji.com/d/files/43994631101.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210916012712.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/dibobige.pdfIn PDF document text
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/dopolusog.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/46272046930.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/bedijemo.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/gajibew.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613926364c4be---dudojej.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/mevalusuxesemexefum.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/tivuzelis.pdfIn PDF document text
    • https://bimore.vn/webroot/img/files/62666128255.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/cc401384d10c957e4f5cdebc0150fc88/xopakubivefezuwizekow.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/2609585314.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/6758386695.pdfIn PDF document text
    • https://organicearthfiji.com/documents/file/tilejesepimosub.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/6cebb662b6b2fd70164f2e8d0133f718/57795623421.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/64444394834.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16143fccbe5151---18492275081.pdfIn PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/24535732013.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/88553042956.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/39749967124.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/zagoreza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=dumbbell+superset+workout+at+homePDF 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_off0000c8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F6 10740 bytes
SHA-256: 4884cb3b0d5d692a45432d3e024e913538a7a2114ec40bc7ef4fea9348df08e7
font_01_sfnt_off0000e192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE192 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A4 17476 bytes
SHA-256: bd268387d3ed7d004faf3b299141ddd9409eb8fb41dddce097653ab4fa8384b0

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