Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f26bb37fbc2554f…

MALICIOUS

PDF

86.7 KB Created: 2021-09-10 05:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 10c95817fdb7230a0a57a946fc482c9e SHA-1: f15bf39c4ef54892e763d3f27c4dafe148e9c514 SHA-256: 5f26bb37fbc2554f5fbfd791d15aa5dbd0e8b7fa7d157395546b4f95950c7716
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern. While no scripts were explicitly extracted, the PDF structure and external links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=stock+rom+tv+box+mxq+pro+4k PDF link annotation
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/19952413905.pdfIn PDF document text
    • https://ever-progress.com/upload/files/fetawapadajeligalimozus.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/5e02427520e1576ef6357aab5524f8ad/daxevimenujirafate.pdfIn PDF document text
    • http://tecksco.com/upload/files/89615120454.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109081457344946.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/85646119733.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/rilenini.pdfIn PDF document text
    • http://sxsasa.org/images_fck/file/1630978230.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/padesadufu.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/45429468454.pdfIn PDF document text
    • https://cristalensi.com/public/File/dagebefiri.pdfIn PDF document text
    • http://www.painters-restaurant.com/userfiles/file/lixajirusawabijidetijuwa.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136634170cac---95613391673.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/lunabujesemebig.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/31660275369.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fe104c2a1---pixekav.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/jajoxiweve.pdfIn PDF document text
    • http://tamphuhiep.com/Images_upload/files/59569360245.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/516dfe31f45f88b9880b5d99b7019f95/kedilikodafezi.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/14651892182.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210908/210908013729704994jrmhox8auxps.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/fadisinidezuxusiwiw.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_off0000ec58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001046f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046F 10528 bytes
SHA-256: bac87e1614dfe7f570fe7883c00ecf36d95e6ef53a37de3079430b55e69612e0
font_02_sfnt_off00011c4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4B 18052 bytes
SHA-256: 2a3bdf8dfad50a9c643b4d6e58c12561cf1ec174ec8c334ed341b74d21c9d1b2

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