Malicious PDF — malware analysis report

Static analysis result for SHA-256 5616085efb940123…

MALICIOUS

PDF

107.5 KB Created: 2021-09-05 19:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fe5453786d3ff8d62a830268115186c0 SHA-1: e1ffd5f1a61305fe06e93c0c3b995775f39c5e0d SHA-256: 5616085efb940123d60bbcc14c5f35bd8093abef21299d81d26e58fc6ecc93b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the structure and URL targets are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/80c6dc68ce7171652a08fdc65fbb2554/muxodazixabusisosoko.pdf In PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/05b49511fcfa9bced68609e45908583d/gukizapuxu.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210530205351.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607963aa2a2f1---6293235704.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094d1e3b1d4a---31821623608.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/4583057638.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/86641421932.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/malotofekinijigalowanuni.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/venujafali.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1611ef9787304f---50125348435.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/86965785238.pdfIn PDF document text
    • https://progin.ch/ckfinder/userfiles/files/danetakefiba.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a40f33c7029---fuvinozesotidivoseko.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/4603849318.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/dapod.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d28d409cb81---sevawapope.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094858f581fe---wosarenilawamapomokewij.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/orobj3gefga8uaogrvnh5fhi0c/71667835136.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/23623436807.pdfIn PDF document text
    • https://unosms.us/userfiles/file/setafeduwidisesabar.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbde0f283b0---kusutetekonituvokarovize.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/71370273763.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=drawing+practice+sheets+pdfPDF 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_off00013ba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA0 19644 bytes
SHA-256: c60d6e42986aa3a794f0f846cd0648d8e4e878fbc8592f76df38b6d76573d848
font_01_sfnt_off00016f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001878a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1878A 10820 bytes
SHA-256: af9b72dbf911e89f61e7a03ab157d4432b8846b122b0074b7811f226c097ff15

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