Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6a465c1d4a7e66b…

MALICIOUS

PDF

71.3 KB Created: 2021-10-03 03:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 676dcd225c050a7e4e1c569526156f58 SHA-1: 07280a865f77e1551249cf24a1d961eea3fb5375 SHA-256: c6a465c1d4a7e66bd8a41cca2bfcf383268dd2579d8c6d218a943e68870ad37c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://irlanc.ru/uplcv?utm_term=tap+house+palm PDF link annotation
    • https://pvcmikser.com/upload/files/77651537758.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210923_151612.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/55510874291.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16131fec70529c---lujibuzukijobipapeferutaw.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/vusodazizejovaku.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/70881147711.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/wijebuziputozarotu.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16151df0e3f801---rijebizebagiroxulak.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/46840006734.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/zajenamugepupo.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/kumaril.pdfIn PDF document text
    • https://digicpictures.com/downloads/92142561727.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/kumosemosazasidabaw.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614df837bd757---devox.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/rinipelumafamazotipebalol.pdfIn PDF document text
    • http://dsfly.com/uploads/files/xudorajipizoz.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/zuwaniduweserikivex.pdfIn PDF document text
    • https://landi-bg.com/images/file/senunipunow.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/18486409974.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/39912922325.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/38858390519.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614df3b68b74d---xiwive.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/69809862814.pdfIn PDF document text
    • https://brukspec.pl/upload/file/wezitepevimikego.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_off0000b26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB26E 10188 bytes
SHA-256: 194ab77c2eca916b15c4ad5c4f34e72df12642c9af51a1a9ba093bdc7b9e5e4e
font_01_sfnt_off0000c947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC947 18272 bytes
SHA-256: 28a83e40d5f2d4158a5732d4b3c5bb87f7f20ff538f49a186653e1e11068baac
font_02_sfnt_off0000f7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1