Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d0fc0dd62d870df…

MALICIOUS

PDF

79.6 KB Created: 2021-09-19 14:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 652d6a5c8ee4a2023f060d84070a8aef SHA-1: 91f7a356ecc077f608ddd3b98aa7bfd1b9794e9f SHA-256: 5d0fc0dd62d870dff7e3de42fc644eb3390d20ada231b4de0669d5aac9fd1537
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads and 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. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://alsace.annuaire-regional.com/ckfinder/userfiles/files/65395649448.pdf In PDF document text
    • https://adikmanis.com/contents/files/51233071813.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/1vp1ab4gis3n7fvolurpn92hco/mumirexaxiva.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/27688593811.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/ca1cc36ecec738acb6294af641e9bc89/regizavavojowemopodok.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/nanekaxenidi.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/lebarufajudugu.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/83564196084.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/32327545568.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/dabegekafodipavumidaxi.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/55506429886.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/beveramewurezijiwukudeg.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/844597308.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/sitepejinotebiluligotavu.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/woludepin.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/tubulidawawatawozojero.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/kixepavadezixab.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613246e1973e4---87422472106.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/kugelijibibamawofotobadok.pdfIn PDF document text
    • http://sireny.net/share/files/robejewiwu.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/51121823404.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/feluzupovapujatud.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/1344833783.pdfIn PDF document text
    • http://e-district.org/userfiles/file/78962682296.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/42543997364.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/napoxifubomokoturo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=funny+christmas+gifPDF 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_off0000d33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33A 10676 bytes
SHA-256: 1348f7b9ebf5927addcd24475399be8b6a7bc3b0b20f9171a37a29ec02446751
font_01_sfnt_off0000eb85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB85 17404 bytes
SHA-256: 348a8d4eb0760ebbc890af0910f7e3306a2d63c1185e735fc62d926a3a9f626d
font_02_sfnt_off0001187c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1