Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0fa23d237481709…

MALICIOUS

PDF

87.9 KB Created: 2021-07-02 03:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ec2a5e605f878900d4b488b1c6d2a741 SHA-1: 1738ffba635a190925857fea0bccbbe5559fa2a9 SHA-256: c0fa23d237481709f4e07c2f75388a05bec5aea2b24915188b28f62cd9ff4e9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://crewmak.ru/uplcv?utm_term=idle+games+hacked PDF link annotation
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765e468e324---xumalerujezuruzikudema.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/61192420139.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/85490441630.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079e1f206bca---81273482746.pdfIn PDF document text
    • http://xn--aknmedikal-yub.com/uploads/file/95324684543.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/81604389357.pdfIn PDF document text
    • https://robertbah.si/files/file/luxuvite.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/18a4365de87af2075fc4c5c97c69bef8/33270108513.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/0871dcb4089d69d5c11eb7f26ed4d105/92660103464.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c248167b6---5127712869.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/a1274c5c305314b839e7a9e991cc8ab5/83047021776.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/85773914222.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/retatoridegavanoran.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc56d49ac1---37023755190.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/5786690376.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/vnm6n9gd1612qsle8qj3ib5il5/5915892266.pdfIn PDF document text
    • http://accronline.com/userfiles/file/57949044535.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/39539238763.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/wupupotisujomuxuko.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/xaxoxevalanuxeratol.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bd6830dc4af6b8925100395242889f1d/takunorigiwub.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/4f0e707767f925c44b29068d63860ae8/tanowokaxutovovur.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/pedijamibiwuwukaru.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_off0000f535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF535 17988 bytes
SHA-256: 1550c887acbbac744458ef1a472ee0f1962c3b4f77a5c366021ea92c882c311a
font_01_sfnt_off0001233b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B52 10344 bytes
SHA-256: 5d94282fc3ac9280de1d3d7644c555f334576ad59be10f2aeda041beeabac10a