Malicious PDF — malware analysis report

Static analysis result for SHA-256 916b406996d9a575…

MALICIOUS

PDF

127.5 KB Created: 2021-08-19 12:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9ac17b3a6e8881e0ca5bed9664b456b8 SHA-1: dd70c04a336a0b6921d494d12c1173def59331cd SHA-256: 916b406996d9a575b90ae8f25edac8879d0c21fedd93e07fc5ed0b89eac5e499
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to exploit users by directing them to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://krisoc.ru/uplcv?utm_term=perfil+topogr%C3%A1fico+ejercicios+resueltos PDF link annotation
    • http://chretkinia.pl/userfiles/file/digizoli.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/82400662059.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/lopiwiz.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/vegetepeka.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/fb3ba60a972360bf8a6b0cb2a92a248c/11069342600.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/wamovomibupogesu.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/jafenakijevi.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/virofevu.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/02rf9stfpb3cl3m4c2p9stcmfh/lixexufukoperaveti.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfd2a3f91e---reradami.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f36e84b19f---48021122711.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/fed01e9b475e91dab045d094e5cb9df4/pejusolelapu.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160799e08665c8---79334113143.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cf18a57a7e3---separubovifuwojux.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/288962a8df5bf84c81f3ad6d803a8d5e/2750886694.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/rizofa.pdfIn PDF document text
    • http://halmar.info/userfiles/file/67330248600.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/semivowanot.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afbdd87b8b4---rosiwifidufolub.pdfIn PDF document text
    • http://lulanjina.net/upload/files/63173228406.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/gfsducjk1e5gt2acgu46c6i1j0/mudizuditewod.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c186e745a21---45049998290.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16096d6165fc2f---91658670063.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_off00018acb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18ACB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001a2dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A2DD 19228 bytes
SHA-256: 95c770f36817cb4662dce42dda5bd2c7b0325e55a97459e45903757a45879aad
font_02_sfnt_off0001d3dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D3DC 10800 bytes
SHA-256: 97242ad13513adfebe2ecb19fb9453aa2c53c594fe1444b546e5a1045d9369b3

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