Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7d58d9e2d642a12…

MALICIOUS

PDF

89.6 KB Created: 2021-09-04 07:06:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 37adf049a9a36087b7337f318f913104 SHA-1: 69216cd01dbf8e07ca172c77c8e63bf56bffd26a SHA-256: e7d58d9e2d642a123b12d558f5217b2a4e0e7b3a617a35224347a95f9219490e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://huntic.ru/uplcv?utm_term=merli+manual+para+peripateticos+pdf+gratis PDF link annotation
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/1nf5b5re4a9tv3vp7k1o17rbe8/gadowulurakodibor.pdfIn PDF document text
    • https://cargotavio.ru/files/file/9020342971.pdfIn PDF document text
    • https://porfic.com/fotos/file/dativ.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/81650194794.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/29523844772.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/dulok.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/178203112f747d073c906f9be9ee21e7/mosunavipuzazuzu.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c02c04d3702---kadagatutafibodipozo.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/febotab.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/c88e32d507c53973e4ed481a1caed9de/63134577605.pdfIn PDF document text
    • http://cochu.net/resimler/files/88748048380.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/85149726383.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/feace05c537f2c8390990c392ef0090b/xufevimadusineguvos.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/3790d09c598bbad5da50401115095bda/wabuduwidix.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/firewojixa.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/cb90a936b38aa408075b4526610f5694/61081990868.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/4996425860.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/27871512786.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/kojakegisorivi.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/65765ed509d98a9d6051aaa429454fb5/63442874104.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/tonirodowokatusigub.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/5793eb715acc8d6d1932da10ac968032/pemonawaregivimokaved.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/didesidalaxojabe.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_off0000ee27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE27 21488 bytes
SHA-256: de481e4a6c390b2c0dd623e37d0543c61d043708b444afeedf058f3db8d0863e
font_01_sfnt_off000126e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E7 11056 bytes
SHA-256: 348d0e84b48cf6701757d0f648c6606dc39b65636b1b4166f43226417fe4b9ab
font_02_sfnt_off0001406a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1406A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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