Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd86a8b15ca1b281…

MALICIOUS

PDF

71.6 KB Created: 2021-09-19 04:27:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fd30503e492ce99f9fed61f87a8947fd SHA-1: adf7de35228c4628241c1f8d54ccbb27ff848551 SHA-256: dd86a8b15ca1b28158f5366741178952ccf0877d062c936eddf187c43d156e7e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, but the link farm structure is a clear indicator of malicious activity.

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://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/4f906694f1ed4f5d0bc177ab3f8e5ce2/36261028386.pdf In PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/75486794719.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16146808c3d437---narebidadapazazomike.pdfIn PDF document text
    • http://professionalcatererspaul.pageindia.com/resume/cms_files/files/munaguzifuwosovek.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/28298537602.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/87483893466.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613335ebb62ec---murovuvimedurakixajowoxo.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/61918245970.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/79298480067.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210907_808C34A86FE15764.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/16730537618.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/db02741c6369226c1966d85940cea871/72560313084.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/61010155368.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/12316721738.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/sosawonoroteroxovutekas.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/ripefelukupu.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/fudedasu.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/mojozuderiruroretasoto.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/najuwi.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/gumapufuluxabiped.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5c69c0043---64415313251.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/rekagomemixuwakosamedo.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/sofowuginofelubupaga.pdfIn PDF document text
    • https://il-gusto.com/images/file/25736158237.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=htc+hd2+android+downloadPDF 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_off0000b86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB86B 16124 bytes
SHA-256: 65c71e9214f9380816550382197da2c1f61beba2187101c8d272f5d01267826a
font_01_sfnt_off0000e1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A5 10364 bytes
SHA-256: 792acac4ad08ed467ab5e75596069f885453a8842d7957bbf40605f2a8b82230
font_02_sfnt_off0000f908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF908 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.