Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac77bb13c7da9035…

MALICIOUS

PDF

72.9 KB Created: 2021-09-03 11:33:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 74bd6c914ae107bc823f7a37c1f5e359 SHA-1: 85b6fe40ea3562923403323847695db441c83781 SHA-256: ac77bb13c7da903517ea3308b8adeef464a5b677fa05edee27c78f2681254125
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS upload storage or disposable hosting, indicating a link farm for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/875ef52bd6c5fbc7fd160c4c21553d22/fifatisasupezomalakewowo.pdf In PDF document text
    • http://northphoenixmustangs66.com/clients/4/4b/4b49b54eec06ebba3741256e9f3e6f2b/File/kojibobojuwiziki.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210815065340406252hvdokgr769p1.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c636d65d755---vafakilosobemi.pdfIn PDF document text
    • http://jngf.cn/files/file/53605365713.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/789c336cb71c46bf01a47bb45098de96/96413928432.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c8e726c52---bovitexopitimo.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b79974633eb---55217805707.pdfIn PDF document text
    • https://fivetc.net/uploads/files/siwaxolipitusetiluzikab.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210901_010105.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/p5rceodmkdakh1b23pj7qjemk1/suxapit.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c89f2a5d22---43214867145.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/vipinebopasumimifado.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62966599982.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608f11c53353b---kixefuvurojovuvineja.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/bibozikipinifuja.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608402735bdc7---xenerugejedizaburebe.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/nepumoviwazow.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/vuwaxib.pdfIn PDF document text
    • http://marty-triple-m.ch/inhalt/files/jizoxomemufegoge.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/5d00uj9lmo8d0j9th8sah69ud1/nelokirof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=industrijska+elektronika+pdfPDF 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_off0000b88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB88E 17528 bytes
SHA-256: 3ed9d3b9c3f7a019d26c16e0f73ab619fda8f9fee046814a8572995d672f6d7b
font_01_sfnt_off0000e5a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A8 10764 bytes
SHA-256: 93279cad5776dae0c63f61c7c24ec77a0a32ab57ff53571a17c3c3a4b4029d20
font_02_sfnt_off0000fe7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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