Malicious PDF — malware analysis report

Static analysis result for SHA-256 98fd9653e7e3902f…

MALICIOUS

PDF

102.8 KB Created: 2021-06-29 16:14:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 47831a3977646eff3df72c3b1486aeff SHA-1: bd9cfa361b828f83beecfbf980859970b7d9071e SHA-256: 98fd9653e7e3902f1ef258feac915d636c2bd8872145fdcbff23d04343a35081
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a spearphishing attachment used to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://philabc.ru/uplcv?utm_term=beauty+plus+old+version+camera
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/cf2kn3ljf4lcde8jefcq759rb3/40078655437.pdf
    • http://fd-health.com/upload/ckeditor/files/nojigupera.pdf
    • http://chia4kids.ru/ckfinder/userfiles/files/88842833026.pdf
    • http://bearings-home.com/userfiles/file/11288734785.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/nml9rb07hjoffveiof935o1pe4/13533649099.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/3bv64akcjblfrbs2ml1vauqk6d/xeratorobebiwi.pdf
    • https://dakhoathienhoa.net/images/files/72699857559.pdf
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/3a487addade8d45c609374c7449617a9/bixizejelefus.pdf
    • http://banghaija.com/userfiles/file/20473249804.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a737a36af0b---dipafadasa.pdf
    • http://lucann.com/Upload/file/89890665121.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ced5b2a4ea7---83674037032.pdf
    • http://heldermusic.nl/ckfinder/userfiles/files/3482855217.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a52d3db4651---vivizagujepidoxegewuweviv.pdf
    • http://groupkaishan.com/d/files/66270760431.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160959bf7a564b---59900635992.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160825d39c2273---3491556133.pdf
    • http://alexanderjamesbackcatalogue.com/userfiles/file/92824944180.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f59127bcfc---68181865838.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c95c51aaed---26107509530.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/j0n4g70fa9omm05acur9pacf18/nelurutudamidupuvule.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/e3a63fcf93e2bea7e6c31f9cc6e7c71e/sonuvisetilixuretizi.pdf
    • http://www.contal-farmer.com/uploads/files/mebolozadelugafako.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000168cd.bin
e6549040a1db7633287c8741cbdb86785d390183d094e3c2d61e8a6bd500ed2d
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x168CD 20688 bytes
font_00_sfnt_off0000f700.bin
e565be6d7c82988ea23675d0b5169f36552c6ac1c52a2bf317ed9a3f6c1c9cf1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF700 11008 bytes
font_01_sfnt_off000110a5.bin
77764fa5524744c083510fafd3572b55a6972a87f5ed2654786149372b6f8c76
pdf-font-stream PDF embedded font (sfnt) at offset 0x110A5 31948 bytes
font_02_sfnt_off000150bc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x150BC 16792 bytes