Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bb9658ec381e8da…

MALICIOUS

PDF

78.1 KB Created: 2021-09-23 02:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9e54bcb4c3982dd7eed419f2ececcfc5 SHA-1: e97135196976723b4eddb98addd90fc2cdd9527c SHA-256: 9bb9658ec381e8da1f1d68f228bac055897f94310cf77f55ad14d4d0cdd1e4c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to lure users into downloading malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of numerous external links and the PDF structure itself are indicative of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://zweefvlieg.net/userfiles/file/63784596108.pdf
    • http://gaziogluenerji.com/images_upload/files/1441069659.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/740kvd71pu3errj3d100r6rju4/71128699106.pdf
    • http://sakesushilakehavasu.com/uploads/files/69689013315.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/t39uucjrvtock651cr4rt00a24/60224264746.pdf
    • http://clubmaniacr.com/campannas/file/82466429782.pdf
    • https://doktor-ara.com/userfiles/files/58211580871.pdf
    • https://taiwancy.com/app/webroot/userfiles/files/musukawenuzerudedunab.pdf
    • https://www.puskinas.lt/ckfinder/userfiles/files/gavalaruvepaputosaton.pdf
    • http://galluccifaibano.com/userfiles/file/48626059613.pdf
    • https://krossi.ru/images/content/files/pobadaso.pdf
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/suvafamadoxek.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161313e5c0fe06---11356638020.pdf
    • http://voszveszprem.hu/_user/file/xejorosejutejopasezog.pdf
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/95984750758.pdf
    • http://ausafe.net/images/art/files/29861453895.pdf
    • https://marblobathware.com/app/webroot/img/files/6598017426.pdf
    • http://espokebar.com/uploads/files/gefozowoxugibikemogisimaw.pdf
    • http://www.look4job.gr/images/_user_na/file/mifezagivep.pdf
    • https://tomclarkvoiceovers.com/userfiles/files/79209309871.pdf
    • http://bienchidan.org/uploads/files/6774489156.pdf
    • http://silver.jo/ckfinder/blanc/files/luvamu.pdf
    • http://www.tamtrebinhminh.com/public/files/jezatekaloxoluxefagubu.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161421ddddc57d---39243171478.pdf
    • https://mb-classic-service.de/userfiles/file/zowojefikatinenixenuje.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=moj+mod+apk+unlimited+followers+and+likes
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cad5.bin
ed6236899db83d60df566a5ec4418529dc5c27c0c3b439118d5406e759a2380c
pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD5 17708 bytes
font_01_sfnt_off0000f8a1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A1 16792 bytes
font_02_sfnt_off000110b8.bin
033685ae1450301ee7d8736429057c4de75fd9d1c9a4911ad8396713ec9b8b67
pdf-font-stream PDF embedded font (sfnt) at offset 0x110B8 11060 bytes