Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dd812de0ee2ad1a…

MALICIOUS

PDF

69.8 KB Created: 2021-09-05 04:43:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6441b2575b8f7516ac55d4b117ef23c5 SHA-1: bdbbc0ab045cee846c7e9e45a44e77fb8c0956fd SHA-256: 3dd812de0ee2ad1aadd9a9a8a51171837964c09b02cf57fb6627df2770bb5063
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a link farm designed to host or redirect to malicious content. The presence of these links and the overall structure indicate an attempt to trick users into downloading further payloads or visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://pixomot.ru/uplcv?utm_term=preterite+and+imperfect+worksheets PDF link annotation
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ab972d679---18627477545.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/gd4r8uc77io4b8ti15e1juicr8/90985306782.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/vejubefoz.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/tevefonereg.pdfIn PDF document text
    • https://sy-tech.eu/file/30900850874.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/71150636450.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/021a622876b5122298c3df0b9fd424b6/xezanefakomerojowag.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16111f487594e9---75670413796.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/88730462580.pdfIn PDF document text
    • https://masukpt1.com/contents//files/bezejapokovuf.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d045549ce---37562748141.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/43a7d4b2d3c73322dede0421b21eee4a/xezomarike.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/78849c47d51e638cf49fac3a6bfd7dee/90680193411.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/nejeke.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/g9cnhct1850ot500a37pm8c35g/2914506880.pdfIn PDF document text
    • http://dejede.com/userfiles/file/movokozobasogesudewe.pdfIn PDF document text
    • http://hamandeggsclub.com/clients/e/ee/ee862789ee8b59d3f3d22261ccc35c80/File/53692272583.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/jatorivufadabeda.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/xebipupu.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/8f65e7169779dec9b3ee1e618b280192/neduj.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/78276285958.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/womuzakodosafopitofo.pdfIn PDF document text
    • http://cocoabuterol.com/upload/files/98182102310.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/medezafijuzefafo.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/50318886541.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_off0000b1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CC 14628 bytes
SHA-256: 6259d0f3d58d15a82f0c2bffe5424564fe24e74cab8f3624a974ae564404df00
font_02_sfnt_off0000ee42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE42 11016 bytes
SHA-256: 118423271bedfa43f8418471b122f1fffd2ebb0bd078f319555aba25087e4f8f

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