Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc956ece8fe7a221…

MALICIOUS

PDF

68.8 KB Created: 2021-09-15 13:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 88e9545ff61e1c5018b77937d7893e0e SHA-1: 4f4305b22483fe2a5f581a12700b90ab8e77bdab SHA-256: cc956ece8fe7a22126fc4c8197fef0ceb69b16246ff3b03320299d6432783d1b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URI heuristics and the compromised CMS upload link further support this assessment.

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://pmapmc.com/userfiles/image/files/lisoruwiwamigatupano.pdf In PDF document text
    • https://warungmimpishio.com/contents/files/fibavenikezudadum.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/jabopejojutojovat.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/20990971167.pdfIn PDF document text
    • http://datcat.vn/2018/file/92333794778.pdfIn PDF document text
    • http://envigest.cz/upload/file/42458422437.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/96649687853.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613983d1258e5---namepodifugexajat.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/fofavojuledinud.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/54117505906.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/vosew.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/xagitadutuzipami.pdfIn PDF document text
    • https://hojoairport.com/images/file/30241884358.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/lelaj.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/5246959473.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/70360820827.pdfIn PDF document text
    • http://ozcetinler.com/userfiles/file/20322409282.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/60996137477.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c924664f7---10095023053.pdfIn PDF document text
    • http://rc-modeller.se/images/file///34002499586.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202193235171739.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e6ddbe978---kagejokosoj.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/kolege.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/16140248113.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=mkx+mobile+hackPDF 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_off0000b158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB158 14800 bytes
SHA-256: de9a8f023ebfdbad1ac62f563203adee7c439c0f85aa0103b3aae07f8efbc082
font_01_sfnt_off0000d69f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69F 10352 bytes
SHA-256: 36c7a22aa219085566a740ca11fdf144d03384ad66f6c6bd1c526e3c57c60acc
font_02_sfnt_off0000edfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1