Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed255645c33c44b8…

MALICIOUS

PDF

84.0 KB Created: 2021-09-14 07:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d7e0cbfb27d37b8885b438118b4a59f6 SHA-1: d4994fe26837975758cfaf21afb94ff49d8d2dc1 SHA-256: ed255645c33c44b8dd7e427e57dc48d4be0b4842e1a6591527f1575c5068e5c3
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several pointing to compromised WordPress sites, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and link farm nature align with techniques used to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://arch.ua/ckfinder/userfiles/files/61006692347.pdf In PDF document text
    • http://oresteruggiero.com/userfiles/files/60709369373.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/mudiremogevireveg.pdfIn PDF document text
    • http://garmaclima.com/uploads/ckfinder/files/44892669033.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/85248043306.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/dawera.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/33133036612.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/79102749743.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613329e69f593---ronesizotolurovisa.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/webixedemixugizepusug.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/xinatixurivub.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/a2091312ec194aa75aa59867e3860df7/52706071033.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/xufobawokaxumawufikowafi.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/xiwapasutoxa.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/fasesomesobixazabewowatu.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/86904539998.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd95e3edb7---90467872368.pdfIn PDF document text
    • http://workontext.ru/media/file/39950186481.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/14023437636.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/7198833683.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210912204359_353080454.pdfIn PDF document text
    • https://onecre.com/images/content/files/ruvigogamir.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/25572546679.pdfIn PDF document text
    • http://supragyn.cz/userfiles/file/73632825673.pdfIn PDF document text
    • https://talenthunt.biz/userfiles/file/90560955095.pdfIn PDF document text
    • http://vswet.ru/f/60272054599.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/kidefixolip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=android+tablet+backgroundsPDF 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_off0000e36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36C 10860 bytes
SHA-256: 9ad3eb1a2daf9e2b87024edc58b55ae89ec49eb964e07ffa207607037f37b30b
font_01_sfnt_off0000fc71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11483 17744 bytes
SHA-256: 71c49a34508af915067e37cb848ed8c26445ed1230c1c6b0572f613d34a51285

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