Malicious PDF — malware analysis report

Static analysis result for SHA-256 76e4298a2f8edb5b…

MALICIOUS

PDF

80.8 KB Created: 2021-08-28 11:56:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2260f1850f1faf21670065331aaf429c SHA-1: 408b65a437abecd2e88e3f6d1eb64c8a9349ef9f SHA-256: 76e4298a2f8edb5b999c35c05ba65320e9ba32d8b0c0485f98f03c22a4cacb79
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious or phishing content. No scripts were extracted, but the primary attack pattern involves directing users to external, potentially compromised, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://abwingssuffolk2.com/uploads/files/masinaz.pdf In PDF document text
    • http://www.awakohchang.com/image/upload/File/1377759976.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/161254300305b7---likuxokumezewurinewujag.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608485e96ea6b---bifizi.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/45048967600.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/c06062c31bbd8eb5c64f0113e3e722e0/71994005880.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f63e77e9b59---fakuv.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/sulipemamexumurazi.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/70954449111.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/9228ec7d9d3bcbf7febc62f8fe9d8ecc/sulejijatufimumamiw.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/rimunibu.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/4973266897.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1610494ea38bb8---gobegipatuxugupoxa.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/fdikjmqemb66l67jd0qa4uf7vo/fizefetatijowilotagisital.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b982d86c615---kokodogevepuzuke.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/ca34d7bc9e67ff20e40522b81acd655f/46340881149.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-7-24/20210724091033974686.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///pazupekiriga.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/69294870145.pdfIn PDF document text
    • http://skomi.ru/img/files/file/pudurimaxipusefabi.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/99796976827.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/51110861614.pdfIn PDF document text
    • http://short-story.ru/upload/file/vebifi.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/kmto8bsvg7l9n7sgpd9j32ncef/30011202408.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=black+canadian+influencersPDF 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_off0000d711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD711 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF28 10496 bytes
SHA-256: e92cffdf7fe4cd1015b948f808de2d6e9dff28f626014a5d896fb2cae693f419
font_02_sfnt_off0001071b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071B 18188 bytes
SHA-256: 08162cde89e345bd825138bed27d548ed3c282f30af1d85b581a9e46026322d4

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