Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c63ae014e20bca6…

MALICIOUS

PDF

84.5 KB Created: 2021-06-26 08:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5351851641bc97d0f60140ad766f1f6b SHA-1: 5bc46ead3dc1232104e53b245f72c3ff0b7fcd60 SHA-256: 4c63ae014e20bca68349a16d1a76acc4e8e7b908fbc09974d80537b4eadb0d2e
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised CMS upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of numerous external URIs and link farm heuristics confirms the document's purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/74ur09tiap9pemn3mqa1ptel91/76588209286.pdf
    • http://graphicyazd.com/ckfinder/userfiles/files/61103391737.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/2a2c5e674382135d0188d02b6f23b5b5/wuruvozifogaxeki.pdf
    • http://xboxheerlen.nl/userfiles/file/77838344772.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8344f27e7---19513247625.pdf
    • http://www.victoriousintl.com/new/resource/files/91011031935.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/4ddfe2f0fef6ec82feb90469ce63eaff/kufipoxinunemujepaviz.pdf
    • http://timebank.ru/sites/default/files/photos/pagefile/zopinukovenojemararam.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/of113mtb3tdrd58md2pgoc3u5m/41860748758.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c23dcaf1b---kubizix.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb88360f49d---dejasadasikojibogabila.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/8e56a628a776452696f1604a6eb7a2c7/89819593241.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607de1c9f0c0f---gupidususazajoj.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e6df5a9a6---91388454016.pdf
    • http://kmkonsult.cz/userfiles/file/gigiza.pdf
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/wuzobu.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f42513fc66---27037595688.pdf
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/4aprq684l6759va1m26hvsho7m/43000032487.pdf
    • https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/34v9vnifm08cliepk4a219gups/sejemubagutuxomebigavori.pdf
    • https://ngoctraithaibinhduong.com/uploads/news_file/waxigoj.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/8a55d2fc671043327706cdf0dcd8d129/74535482041.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5tilsld7h0k4plhtlrdh3m1pp6/16178831111.pdf
    • http://nusratali.com/userfiles/files/64435091509.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=mobdro+check+your+connection
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea0c.bin
3c2a38fc0ef9e8e4b427a23dee6d0b4d32ed55e165a1e3ee5f7002628347fa77
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0C 10532 bytes
font_01_sfnt_off000101fc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x101FC 16792 bytes
font_02_sfnt_off00011a0e.bin
fe82c3bdcd81cddbf23f0cd6a39667329404c40c4b897cf14785b2e57490e65b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0E 16032 bytes