Malicious PDF — malware analysis report

Static analysis result for SHA-256 8394a65647553bad…

MALICIOUS

PDF

71.1 KB Created: 2021-09-13 14:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c5f1725a3d3b83d7b22db12070d35250 SHA-1: b8bed835b1e449070e4e9201765bd055a6b6639f SHA-256: 8394a65647553bad1c637f2ce370602c08686cdd69eef5496214c0b81f358d61
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://philabc.ru/uplcv?utm_term=international+journal+of+operations+management+pdf PDF link annotation
    • https://marugame.hk/editor_upload/file/29654381267.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612edc06723d8---62865547849.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/85931802367.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/vufugeki.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/31592370770.pdfIn PDF document text
    • http://erfansari.ir/ckeditor/files/files/xareketaxe.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/dagewubiteni.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/sapato.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/fopcc8jclqjrra4l7ufb0u85h1/87520341119.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/rurezesitanatagerarutabeg.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/tuguzapoxifovaxuveb.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/lenul.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/xazevovefuzu.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/bezama.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1601888e7---30184506851.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/88623588.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/mikejefosid.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/10669625253.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/83811675735.pdfIn PDF document text
    • http://cityfate.com/files/files/69469032406.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/zakijirajovu.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/merugenorezazelojitetom.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_off0000b4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD8 15884 bytes
SHA-256: 9f1460ba2fe1f7a48e2b70d5bdf6d156ac0d92e86463f0652ff93a171cc054a0
font_02_sfnt_off0000f541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF541 11020 bytes
SHA-256: 4fb58d3361d909f90f4f957ae370b0a53c40706d2a8442defd9e276fc70639e0