Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed904f3e5092ec51…

MALICIOUS

PDF

89.4 KB Created: 2021-09-20 02:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9a631ed5aa7cde699792307fd5d27d33 SHA-1: 57d39cff448fd5fc708ac6072e1ca04dedc27ab7 SHA-256: ed904f3e5092ec51548dc036f05855e3596ae6ab6b090442575044631a9c95d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and link farm indicators strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://laborke.ru/uplcv?utm_term=dungeon+master%27s+guide+free PDF link annotation
    • http://kondicionery-noginsk.ru/upload_picture/file/37996413621.pdfIn PDF document text
    • http://balone.net/_upload/file///xuvurowedegulomarat.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/fesodatosijumetebapudaw.pdfIn PDF document text
    • https://dejavuruse.com/userfiles/file/72035199365.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/pomalafafufirigizef.pdfIn PDF document text
    • http://xn--spreewaldpension-lbben-9lc.de/meineBilderAlbertGrundschule/file/20479982483.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/63757472007.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/rewirudimexozazozojowuwe.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/gaxop.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16145b9298d091---bexisunemevuvejavabu.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/81650301371.pdfIn PDF document text
    • http://quranday.org/userfiles/file/39249957899.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16139a16370f50---18031756539.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/8080246549.pdfIn PDF document text
    • http://autovoda.ru/upload/files/wefutajugakeniki.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/fajaxusoxudilinigo.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/060902586299.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614409b242554---42916251868.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/54307073652.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/68090952065.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/57560906530.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef90b09309---pogofiwizenufixutabin.pdfIn PDF document text
    • http://redactron.com/userfiles/file/gosiki.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_off0000f438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF438 19424 bytes
SHA-256: 2ec52513a623eb3f4b75f77e4249d8ba3cb68ef08cf392e7c24571e071b5be1c
font_01_sfnt_off00012732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12732 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F49 10784 bytes
SHA-256: ec26dbdc97929d3cd7b88d6795449f370669eda95f5085428630aba117a26d96