Malicious PDF — malware analysis report

Static analysis result for SHA-256 04259fd5fa173743…

MALICIOUS

PDF

70.2 KB Created: 2021-09-01 16:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5a814f12b3b7a3f7081b0d7875e47704 SHA-1: 931b987225720ed1b87c95fb4ee18eab42154fad SHA-256: 04259fd5fa1737438449cfd95bd03d47c48b98c61fe0885c0bb12b9d319d3db8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to phishing or malware-hosting pages. The presence of external URIs and link farm heuristics strongly indicates a malicious intent to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://wastran.ru/uplcv?utm_term=you+look+so+beautiful+message+for+her PDF link annotation
    • https://walkandsmile.com/userfiles/file/27534839672.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/viraniv.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/22472383282.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/k32gasrsa418p362untnh5fbc5/89930224743.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/tuzoxivagan.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853b2436518---95174573732.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/nokati.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1a76160d2---legezedemuf.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/16897a19d9a61373191e07aa35ecdce6/zaxexakijuzif.pdfIn PDF document text
    • https://sanidom.pl/img/file/pisatekama.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/37395160872.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0753f1815---14896679086.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///sufurefizidalozivukomod.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/nakosuvukezodoxaletew.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/fc6b461a0957ed51a16a748f93c47089/77172802703.pdfIn PDF document text
    • https://ubranni.com/uploader/files/sujesilovaja.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16076f4fea03d0---26388611819.pdfIn PDF document text
    • http://stylekd.ru/files/fukivufalofefatokagetamo.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/welezarujifo.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/bojk8541ojq2f23pduikpv9kn3/pinedumisopizilodada.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ce770c2e3b2---29084934434.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749e911ad48---relefuketolipakegenajule.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/nojogubaraxini.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_off0000b466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB466 10872 bytes
SHA-256: c6203a2fc41395f10a4edbfbca01a9b1e190d609ed991fb40ae25d6c5250258e
font_01_sfnt_off0000cd87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD87 14936 bytes
SHA-256: 767391cf2d9b1ec86f94e74dd077dffece7f943cd2e0bc7c4d6aee4e5d1e4d8b
font_02_sfnt_off0000f321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF321 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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