Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cdf402bb88e78fc…

MALICIOUS

PDF

83.8 KB Created: 2021-08-30 17:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 6f6bf633c50d02735ffb877a368d595a SHA-1: 907f52d11c6f8ace685c09565ad4ba3bb011082e SHA-256: 9cdf402bb88e78fcf7bb63b7ea4ed5e0edbd3aa647605337587d63c3f3510f80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/hq2pt57jrdnfe7ueo6m9flobq6/judoxebitusi.pdf In PDF document text
    • http://wamer.org/userfiles/file/97166202216.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/luzirelipomadulobijobe.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/4be64d347dbd952639129534459963d5/65320636345.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/58089025841.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/pomubog.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/meluruzukog.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/25f675011dd7c660ec6cc0da77a4801b/42075443882.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16080c27deb55b---tuleriniri.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16091e06e9b105---90470201669.pdfIn PDF document text
    • http://dzbnf.com/upload/file///29738060730.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/s6ebub07mc6qkq205e09hijfb4/zunosiramitixi.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/vivisozaluxogufutovize.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210816_78187327224C2980.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/a24elghd59m7bsuhks9vuc9ok5/72070132633.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/7a506c93fd4e755db86ecd170fcf1086/43978668436.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16072fbda00d36---74944904004.pdfIn PDF document text
    • http://elitvorota.ru/f/file/bomid.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160f73ab07a6cd---7235239188.pdfIn PDF document text
    • https://cakkue.com/contents/files/80249077874.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/zumupukikivonixefofoxip.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/menevaluwizumadebibigok.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/vofiguduwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=brandon+routh+and+kate+bosworthPDF 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_off0000ddd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD5 10680 bytes
SHA-256: 7d2b9dab484bad36a344c1a306d2bc9f4b2b6414f9b1180da017dcb31a74a0df
font_01_sfnt_off0000f657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF657 19120 bytes
SHA-256: 8b14f8a52ad00d6fdf140cf2b13bf20b5889b204ea8516e60632ed216bb9bc9d
font_02_sfnt_off000128c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1