Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0c9f55e6045d120…

MALICIOUS

PDF

75.3 KB Created: 2021-07-29 17:36:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6df9495c9c7a198d2276579f7426de96 SHA-1: 6ec396b83e7564da7eaf6f1f465d7cff08f27e7a SHA-256: e0c9f55e6045d1201e0052895d8d91458b22b8ed4a76ee47d60ac479049bcb45
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 upload directories or disposable hosting. These URLs are likely intended to lead users to phishing pages or download further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a link farm used for distributing malware or facilitating phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://cructi.ru/uplcv?utm_term=vector+calculus+marsden+solutions+pdf PDF link annotation
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/4c9f972241aa8c3f6197dd62f4d6bf36/jatirulevurogifesugid.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/502c4377903cc05705fdcedd565f399f/28907124311.pdfIn PDF document text
    • http://partnercable.hu/files/suxuwadasowivabubupujedam.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/61048227117.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/19d8d8af557ddfbd5a5909deb37eb488/17133029395.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/81cb7eb9bb77de61c228dfae0bbab6ff/72489640732.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/68039839310.pdfIn PDF document text
    • https://mollis.rs//files/27270986116.pdfIn PDF document text
    • http://blueyee.com/upload/file/222347572383.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/xevimitebinowotepuxizo.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d0632775dc2---63471893553.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0a4f1c103---79747531570.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/17358671530.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/a79a303799e0896bca19c97726d8842b/wizinonegabovifobemiril.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/klqvqpk68d8e9fbnc0glid47e5/20894526982.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/7c69ecaf1f3dc70c3306de2b7db1ff47/96751869834.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/majupepimexitoketixagisi.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/77377459670.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/tegh6nania8i2ks8tkmut9t2st/mujovegegitu.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/jukidejunobuguw.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779429dba47---kigef.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/h31qq9t5306t56quk5eke6mp8m/fevajezegaw.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/vogiw.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_off0000bfa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA6 10852 bytes
SHA-256: 5ae05afd70c854fcf7613e6895ed724736607cd4406bcf730d85a50c3a9dae6b
font_01_sfnt_off0000d8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C8 18572 bytes
SHA-256: f9685d5dc0dbfcdcd878e74064ec79ecab96ca24509c7c50066b21e5a7ae43d6