Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b63cdae82db0295…

MALICIOUS

PDF

71.3 KB Created: 2021-09-18 17:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b6b02bcd66e63e431c96e8344cddaba8 SHA-1: 0d524efc8c1458f91d159f77a6c3772cd9b6358d SHA-256: 7b63cdae82db02952630980d3bebccb8c77cbffa25e8b90accd48f6de7d2f094
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. These links likely serve as a lure for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/700f33a000119bdd026a0fd7cbe7d735/45232345656.pdf In PDF document text
    • http://monkey-do.net/userfiles/file/vokedulonef.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090516442511.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/xitikinogavufebelulu.pdfIn PDF document text
    • http://tataservice.it/userfiles/file/86987089492.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/1654176124613e92671fbf3.pdfIn PDF document text
    • http://adatarimhayvancilik.com/Images/Media/files/panelege.pdfIn PDF document text
    • http://aven.su/userfiles/file/38367223594.pdfIn PDF document text
    • http://gavionescodeinsa.com/userfiles/wuzerazarigavefam.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351adad72ad---gurubenijaloxeturi.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/22030036010.pdfIn PDF document text
    • http://nusamulticentralestari.com/Uploads/userfiles/files/40226606481.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/doguwegesowagorib.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/53394472650.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613a452e8633e---74456259936.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/15180052484.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210903195501.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/zemonetobiwavujixifuludox.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/20109819651.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/4047028764.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16142d28b6196e---nidigirudum.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/31185775200.pdfIn PDF document text
    • https://euro-m.si/web/dokumenti/file/63847450650.pdfIn PDF document text
    • http://sichera.eu/userfiles/files/91848185122.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=sad+quotes+to+cry+toPDF 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_off0000b8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BB 10556 bytes
SHA-256: 8eac4aba10c716145c1f2fec1abd2d98a169fbdae43dadcf554dfb306891eb35
font_02_sfnt_off0000e8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C0 15564 bytes
SHA-256: 73bd16674aea3122c50ba53b66289d3b45de4a9fd271ca81cef616b66d958f94

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