Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdb9f4eff6d810bb…

MALICIOUS

PDF

128.4 KB Created: 2021-07-14 06:41:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8a5ffae47b698998fe8c94a1f66b48d7 SHA-1: 2e5b12264c6348aa24bfe61c995ba42ef3a2967d SHA-256: fdb9f4eff6d810bbdd3d90fc4a5bdf47fc315e61b33c09af394faf3ee9c5d380
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, which in turn host other PDFs. This structure suggests a link farm designed to distribute malicious content, likely for phishing or malware delivery. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9689

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808791169cc---84728793988.pdf In PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/8a8ee5d755c1fa9f82c22eddc6bbfcbb/79985058010.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/7fr8g4ogb067cchi6qovs6juvc/8874653919.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087f66d90da2---60770656953.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/18180233667.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/55603940088.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/zesomivazalulefoxuwitar.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/7kmf9ned3n8s8d1dv70215jej7/wokek.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/92s19j0e1vcpioss7ne265dgnp/21268169175.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/65859838841.pdfIn PDF document text
    • http://cursosadistanciayonline.com/medios//files/16927404168.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846a089e81f---maxirasana.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/66362129269.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160aceefd4272a---jutometekiriwolow.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/kibimadenoko.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/6710098078.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210525105632.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/5aa364d074014e08ac593ec819ee22c2/rurexawalesetemejawujito.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926a1befaf3---pejevisonalajixezefixo.pdfIn PDF document text
    • http://nbpcpentecostalchurch.com/clients/65183/File/63818031091.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/babulasuso.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/35c1c77c6c62d9920add591a8dc1d23f/98192303860.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/gffthj5oq5ssfketd6klru8pm9/gudinoromemotarex.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/tevoxodepuxujapukifixuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=tangent+and+normal+to+a+curvePDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000169cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169CC 2880 bytes
SHA-256: 1087ecbc51780b8f8fab6ae040931c47fa67bea1195d5ddcba2df7b8f345979a
font_01_sfnt_off0001753e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1753E 16084 bytes
SHA-256: 325c5f5cda05429ae92d15c23118ca1b8712e485108c584e1e30b0ff615913b7
font_02_sfnt_off00018a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001a281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A281 10584 bytes
SHA-256: b69e47e4aa9e7560f0a5851fc330c6482e3939c2246f13bfbda416a9c4165e3c
font_04_sfnt_off0001ba7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA7F 22468 bytes
SHA-256: 096536791dba03636d9521cceb22f92cfa6bd35d813d780fcfa4b5b33def3ccb

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