Malicious PDF — malware analysis report

Static analysis result for SHA-256 02f00b25a20cb5d7…

MALICIOUS

PDF

80.8 KB Created: 2021-09-04 02:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d9899b57918c1258a009c94484177871 SHA-1: 1e567486a089ba5df4fb70dfa2215a0e007c18b7 SHA-256: 02f00b25a20cb5d72a89244af05b00f9d02baad7adb4b40c8e051ae12c321d1a
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 compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via a spearphishing attachment. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://medvor.ru/uplcv?utm_term=oxford+reading+tree+books+stage+1+pdf PDF link annotation
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d4ccbe77fe2---sanapigo.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/kezuvamep.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609612e248210---24212713390.pdfIn PDF document text
    • https://spacio.hk/attachment/file/87956552445.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607edda83ae57---momutunabuwojoluxidelu.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/87398717438.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/wujivabukazo.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/71480324582.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611dc61ecd7e4---mipuzevafi.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/xamibu.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/13796398585.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/5209019875.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/2630122003.pdfIn PDF document text
    • http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/10141742716.pdfIn PDF document text
    • https://bursac.net/userfiles/file/babodotifukezof.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/mupekevoganapugo.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/0af5209003f119f0ae5b4e53b9c9d81f/23551144479.pdfIn PDF document text
    • http://chinalabware.es/d/files/73414090362.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/52950986136.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/24312951687.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8dca65923---68962130923.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/72128988533.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_off0000d6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF08 11036 bytes
SHA-256: 9646e33510a72b3d73143ac2bcf9e7c74f23a165cc57b36f5948ce85a1e1ff90
font_02_sfnt_off0001087d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087D 17480 bytes
SHA-256: 91ac0c498d11a7824c0f191a5cd0a4bde7230328e7fcdd05bc0bbd31bd1b2203

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