Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f72fe822f0169a9…

MALICIOUS

PDF

90.4 KB Created: 2021-09-20 06:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: df664053b33ed13404671b992f3bc3b6 SHA-1: 16146f9049bcc149fe252fd1fea5db9d07c704ac SHA-256: 0f72fe822f0169a944ba3c769c566b6c60448e24ebf09708a3f34f02b6f3b9f5
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external links, many hosted on disposable domains or compromised CMS uploads, suggesting a link farm designed to redirect users to potentially malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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 http://dpsnowodworze.pl/userfiles/file/35283373062.pdf In PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/61268478400.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/63204884007.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/5255310851.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/45592755622.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/43630610448.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/vosomazidizatugum.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/xevumewidi.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/xetedenajil.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/97934771325.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/05/file/20210905_230110_154.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143437081352---66484466289.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/bofal.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/likikumumoxoj.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/67559914591.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/63602985487.pdfIn PDF document text
    • http://caythuocnam.org/images/files/janedivufowiwowijodenedop.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/d97d8e61d8ce0a1b7dfc692eb968d7f7/93314227519.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/53639586729.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/nofolekexux.pdfIn PDF document text
    • http://dytac.hk/userfiles/47737452995.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/60103625092.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/89985339851.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/ruwetip.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161466136a1e8f---vajipizi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=anime+battle+unblocked+gamesPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF975 10928 bytes
SHA-256: 2b3b75b06e75f69035c6c60b0725b48098246490993c558ae4eaad484ea28261
font_02_sfnt_off00011298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11298 17412 bytes
SHA-256: c136be9b3d0794ed7043563723445ba062070af8bfbc3b09c591e17f8af7d0fd
font_03_sfnt_off00013f9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F9A 18048 bytes
SHA-256: fcdd02b902c7dbcb170ff2d23c44c6a3d37cf565922f1fdd96c44cb0cc85bd81

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