Malicious PDF — malware analysis report

Static analysis result for SHA-256 928c236458520069…

MALICIOUS

PDF

83.1 KB Created: 2021-09-04 06:03:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1cf1d23e4763e2ffa7601dc92a1038c8 SHA-1: de03efe8930af51ad027dcae87380022029d2896 SHA-256: 928c236458520069016561da8317e5cb62c276c4d82256435430e9d4950506fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, many hosted on compromised WordPress sites. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to phishing or malware-hosting sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://infrive.ru/uplcv?utm_term=nonprofit+policy+manual+template PDF link annotation
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b80e235cbf5---pikawefituwe.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/gudijowinofefadugitowud.pdfIn PDF document text
    • https://cebrigantina.com/025-CEB/images-editor/file/87698099759.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/76180492305.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6406085eaa---22770605978.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/sefalugatirozerus.pdfIn PDF document text
    • http://billsky.ee/files/file/pabeb.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/kalimuwuvatotev.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/72958195471.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/25852009386.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608bba8598a3d---20976955830.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/fiwafat.pdfIn PDF document text
    • http://globeksa.com/ckfinder/userfiles/files/pabigexaw.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/fafozesalosorikosilufor.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2617d3616---84618033951.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/vufeza.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/39256558132.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/busobim.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/notinamaxulobibaraleviv.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/993fe0abb388ba622b4069313214bddc/62865863713.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc2b085768---pozubinu.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b7954b144---42423791236.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/bavelowinibobevusur.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2cf6330be---vilolazisalakipebegim.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ed8fbb5765a---85900639916.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/83146459642.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_off0000dec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DB 18304 bytes
SHA-256: a6541bc0d6343efd0b052a7571ba13a1bff760b7326ab24b01dbfb1649c02884
font_02_sfnt_off0001264f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264F 10664 bytes
SHA-256: 6135319ca9f41838f6a489436b9868a4e029011495f85972abc31f3a416dfa62

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