Malicious PDF — malware analysis report

Static analysis result for SHA-256 b99e23efa789a638…

MALICIOUS

PDF

89.8 KB Created: 2021-07-26 13:21:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: e45a3d8777e5b9e062c4ca5d685811c5 SHA-1: 402210b31cba9f3d2b2162c45bfb26d72d5593eb SHA-256: b99e23efa789a638c8cc4fce950cf291fab19d6cdb350608a4147e855bb4604d
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://dhesient.com/media/wupanazakesixogopeme.pdf In PDF document text
    • http://younewstoday.com/task/userimages/file/95899849619.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/87080457540.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/rerurexodebopu.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/b224762077650fe7092a44941c0cddac/41037060049.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/giseriropalikobatubi.pdfIn PDF document text
    • https://securitydm.com/slicice/file/vuvelo.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ebfb95b166fc512aec987daed18bc658/zelumelimeken.pdfIn PDF document text
    • https://anjingliar2.com/contents//files/17261745868.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/cb4e216da570b53802c428681d0373e2/tojawamimeperon.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160cefc5c975a5---26442626483.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/15d2120b49113852c98fee901e774d1e/5315617119.pdfIn PDF document text
    • http://etre-belle.su/images/file/lazowun.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940afbe3304---xugalurituraputuvurak.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a137f4d9810---11175318157.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0aa6a429df---nafamosakejaf.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/78854284898.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5b62c65a4f---94373199350.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6b906e0b0---91598579466.pdfIn PDF document text
    • http://calzaturificiocatia.it/userfiles/files/jupekufofabo.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/85399463811.pdfIn PDF document text
    • http://usateatop.com/_upload/files/2923668263.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-25/20210525210758651853.pdfIn PDF document text
    • http://novichiha.ru/pic/file/88153839513.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c80219ca75---pozararenafukewanibavo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=oxford+medical+dictionary+english+to+hindi+free+download+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF326 19084 bytes
SHA-256: bbbb38b653774cb20c7ae457c03631140284936c837c663f3aa8e9bda717992c
font_01_sfnt_off00012434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12434 11396 bytes
SHA-256: cae498c0b6d07bcad3fa951d088217a57384905d81ca8e39897edb609ef1b0c9
font_02_sfnt_off00013ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1