Malicious PDF — malware analysis report

Static analysis result for SHA-256 49152c3fcc012cf8…

MALICIOUS

PDF

102.4 KB Created: 2021-09-15 09:22:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f0b059834b8df0e8fd3c5321e1e79f76 SHA-1: 2719f1d930f8ad4967520928061772a71aaf1885 SHA-256: 49152c3fcc012cf848876547c2eaf968b6d20bf46cf0ca1276cd5d7b6fa9886a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted from this sample, but the presence of multiple compromised URLs is a high-priority indicator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://wastran.ru/uplcv?utm_term=new+super+mario+bros+apk+free+download PDF link annotation
    • https://nic-irq.com/userfiles/files/70940028318.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd6958d50b---14030301706.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/bbfff205434f80e223619fb00c0cd9d3/zinerumiwerapelulawaguwa.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614187efa12ca---77638265443.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/869c14581bf48f218771a280b49a17af/42318737792.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/70361596627.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/86643820102.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/30174379020.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-14/20210914185025598642.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/xusuzaz.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133317312d18---91889215165.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/41276313787.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140a50eceb04---43471775185.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210912_F6F4023B3055725C.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/5459125192.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/rapalididexixugopesazuru.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/gukazobogozulumofun.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/86429795203.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137823fed098---tutabolomoresafopavib.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614139fcbf3fe---71250797586.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/32082706450.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/32443716771.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/a4d52c53f648da2d4997ec1ec154787d/xuridepa.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_off00012b67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B67 17916 bytes
SHA-256: 84c2a88586939602ce9d7c2fc9039cf75cc8569107ff4e8db4ab0a7e90dc3827
font_01_sfnt_off00015a44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A44 10956 bytes
SHA-256: 1a8f47e1cd54afae4980037532d6142d74e4ae617365c6047edc8b9a116cf5c5
font_02_sfnt_off0001737d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1737D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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