Malicious PDF — malware analysis report

Static analysis result for SHA-256 edd6fd42a40ad06a…

MALICIOUS

PDF

81.5 KB Created: 2021-10-15 14:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8d35dd4d71580eb4a84cdd409960cf25 SHA-1: b1cefca85e0eb6f28ea77ff4a04c4e814d48b912 SHA-256: edd6fd42a40ad06a890e899c81282e094b79bfcd102a2ab201f63158301568cb
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve as a link farm to redirect users to phishing pages or download further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://chcial.ru/uplcv?utm_term=capacitance+and+voltage PDF link annotation
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/b09cc89e67232f6466697fd18f05b76b/morajeduvizosimijufej.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/dajujakadepej.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/66661336001.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/puranamasu.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/27495629836.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/76503385857.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d86e4e085---65261149467.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/rivuzolasewamuxeje.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/19338442928.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/zalubuxisiwidur.pdfIn PDF document text
    • http://pjteam.hu/uploads/72376758308.pdfIn PDF document text
    • https://yourwebcenter.com/files/file/37167851181.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/adc82c1dbb023beccc875d567d932cb8/sovoko.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613e1ebbc7ab5---92146983617.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/9223657435.pdfIn PDF document text
    • https://kinhdoanhvaphapluat.com/img-dn/files/24335958012.pdfIn PDF document text
    • http://attlas.center/userfiles/file/47092503593.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/3443334018.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/76f6f278f13f6f44ac7987a423584945/gorajufawakibidubir.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/55062082152.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/peruwuzawoligumi.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/97755798126.pdfIn PDF document text
    • https://baldai.manovonia.lt/images/files/zugil.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_off0000d880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD880 18816 bytes
SHA-256: f5fe574504992b5908864808355e4f27186d9516f01d2899fd6c79fb4033e88d
font_01_sfnt_off0001089d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B4 10516 bytes
SHA-256: b08085d32815c2757f5a5510329cbf142e7a02fca06d1562d36645139e6aef88