Malicious PDF — malware analysis report

Static analysis result for SHA-256 10ac4926f59adfcc…

MALICIOUS

PDF

82.6 KB Created: 2021-09-05 22:29:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f45bf143530a4ee29ca79f8a8df953c4 SHA-1: 4a672e5bf72e4af49545fbcad14fb66d2cf06661 SHA-256: 10ac4926f59adfcc17c4a5e340fa4ff5d8d92762a1ee57ef79d125612a0cf236
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to potentially compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://pinyardim.com/calisma2/files/uploads/fazisixurabive.pdf In PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/sijekixaxi.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/7b50796ab602bb6b6ecbd13d57fedbcc/zezut.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/48368398947.pdfIn PDF document text
    • http://fitviewer.de/files/file/31526976039.pdfIn PDF document text
    • http://xn--aknmedikal-yub.com/uploads/file/gosituxojir.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/c28150fc62f4b779b2f6604c501d574a/40550462372.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/77310188916.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/surojudowiwovepoturez.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/s2drr0v8eejs1k53m7fckfcjo6/15209551982.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/e7320d2045e713411d3d2627dce5193c/41272359576.pdfIn PDF document text
    • https://agatanorek.com/files/file/17672740463.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/18006cbf08a658d8ef8400f40b87882f/kanekenupakim.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/cbecc20d44e8d7b2061b8d37a6588f18/zogisu.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/56501123298.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/10867199363.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/46379200009.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160be306e098cc---42658261412.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/48815309077.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/50549796849.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082f2d875eb4---tekenozenuz.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/26392784810.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/28616546637.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/lakodelob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=introduction+to+philosophy+of+the+human+person+cg+pdfPDF 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_off0000dc5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5B 11232 bytes
SHA-256: e27cd161183aa58d25c5dda000268a95f1756b12bdcbf17289bc88b9d77ff1da
font_01_sfnt_off0000f656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF656 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E68 17976 bytes
SHA-256: 1b0afec3b470e110efa279aa96b3c6c995dd7a37136c9debc045a3e7426e407a

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