Malicious PDF — malware analysis report

Static analysis result for SHA-256 25ee12ffcf7ad093…

MALICIOUS

PDF

74.3 KB Created: 2021-09-16 01:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 68a1ea248705386c13c61c97d932234d SHA-1: b970f48972f1c22fd6f815a95dbf082b0aceee13 SHA-256: 25ee12ffcf7ad0936e4cad5faee6d02aa783c877bdfd00ab42f4428fb47ab9b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of external URI firings and the overall structure point towards a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://smidgel.ru/uplcv?utm_term=minecraft+apk+new+edition PDF link annotation
    • https://www.sterlingsez.com/ckfinder/userfiles/files/kunenilutujijapitiruxi.pdfIn PDF document text
    • http://nut-shell.net/upload/files/8222890503.pdfIn PDF document text
    • https://gencatakan.com/upload/file/tusugojagajaxefewatew.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16131a63eb6824---suzijidukupovoronuxozoxoz.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/zowowe.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/10785203253.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/zizisabidirelu.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/5e163a079c381f7feaf7be42edd05acf/gagexapukudilomarujutobi.pdfIn PDF document text
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/66963219485.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/97403796401.pdfIn PDF document text
    • http://safetruck.gr/images/file/redegutaguzexepuralegabej.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/paxijimitaxixinagumoker.pdfIn PDF document text
    • http://taaltoetsvo.nl/userfiles/file/faxegukejidadose.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/gigop.pdfIn PDF document text
    • http://autothudo.vn/upload/fck/file/93587473133.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.com/userfiles/file/5420376856.pdfIn PDF document text
    • https://innotek.vn/uploads/news_file/66749556063.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/74458962218.pdfIn PDF document text
    • https://senfina.top/uploads/files/46750427241.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/74481439084.pdfIn PDF document text
    • http://theofficeplus.com/userfiles/file/61297123892.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/d64fb26e60c021844b84fbd29f58492f/jowugibutovaropomo.pdfIn PDF document text
    • https://andhimazhai.com/images/files/bebijonemagawalisuvi.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/wixirematexivufavera.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/37158063927.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_off0000c1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1DB 10572 bytes
SHA-256: 237d4e952686b452079c28ff17bd1bcfdaf0b97b45b7d926a224ae455934a671
font_01_sfnt_off0000da2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2B 16216 bytes
SHA-256: fa9bc4832ad92412bc767458f535cf93ac429233927554362c85c4b85247ac87
font_02_sfnt_off000103b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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