Malicious PDF — malware analysis report

Static analysis result for SHA-256 7053367fbe80fcd5…

MALICIOUS

PDF

88.9 KB Created: 2021-08-14 10:11:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4599e85f717a76b9e2f5a587ea05aebd SHA-1: 6493d25d139687060934d23bdd759b678c56b1f2 SHA-256: 7053367fbe80fcd595d1c7118d61d7962e41a78b2fdeb90f2b632bfdcb41209e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and numerous external links are consistent with a tactic to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://medvor.ru/uplcv?utm_term=smoke+detector+beeping+with+new+battery+reddit PDF link annotation
    • http://shopcode.ru/uploads/file/25170534368.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/f2adfd4c093f613901303d4e5ecd8d06/15245626903.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210602_021309.pdfIn PDF document text
    • http://gardnersunited.com/clients/e/eb/eb3320446930dd457027df34457c622b/File/67764961086.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e6c80cfe2---witikesomudivutajikape.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c22221eb9---24937230806.pdfIn PDF document text
    • http://starlightcelebrates.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/penagufu.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a64381a43e5.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609eff8016de6---govitix.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/kanoxivasanij.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/30110628961.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4a2f12864---pusababupageda.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b08a094c177---dojusixegido.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/78844705694.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/44946962202.pdfIn PDF document text
    • http://coinmarketsuite.com/ckfinder/userfiles/files/50246093549.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/vevisojuzefalago.pdfIn PDF document text
    • https://emmaushuis.org/pages/97055525077.pdfIn PDF document text
    • http://magicdiscoradio.hu/userfiles/file/69503443516.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/30324032820.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/mipogejetugos.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f667e916c---2968189108.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608205854b182---dokivewenubuxa.pdfIn PDF document text
    • http://forti.in/userfiles/file/sejiwipife.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/wifaravasax.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_off0000f749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF749 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5B 17160 bytes
SHA-256: 8dcabd96c8248c9272d51ba92d7877107ec16d450daf00d4a5d55e85feda9e59
font_02_sfnt_off00013c34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C34 11256 bytes
SHA-256: d92f7e7d150687c90c504221159158e47c2cc398d8d7cc9c91af9fd2f3cea6c3

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