Malicious PDF — malware analysis report

Static analysis result for SHA-256 c809717f4f62afb8…

MALICIOUS

PDF

93.6 KB Created: 2021-07-23 13:32:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ac78491e7d3d69744930a37e5fdaeaa1 SHA-1: 5182008fd36d6a68e65833ae7cf423dbc1d18364 SHA-256: c809717f4f62afb88ace04e703d2e539552e55d72cf4a7913c67c83852457a1f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a lure to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/810d79aa5ed68bc801feb0371f37faa0/linetugafexogitonus.pdf In PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0312c1a9d---rijopodevaposig.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/xuvirojegofuva.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/8a3033ce76411b101186e3cc86f4a769/vubawa.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/7qdmsvmm028uqrj1tfvuqjprm0/kesufirikapofituvu.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713f62f0884---jinusujixoxisujavoluma.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/rivov.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/pinusavaxefobunixat.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/618d58c5697767179e1f93d00a74b6b3/95964996256.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5ad562a8a---89071100903.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/16282454160.pdfIn PDF document text
    • https://groupunsur2.com/contents//files/kekuxototikobuxumurex.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160d192f4ab157---vigadimexifotubil.pdfIn PDF document text
    • https://clubsportedinburgh.org/userfiles/files/nozomigofagodofinuw.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/55617532193.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077c8ef219c1---tunazararuvebimujorixivi.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16087cba2a7134---kipusojasigukosiwebidat.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/jepijol.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085d53d5634e---dugovigus.pdfIn PDF document text
    • http://mistralizmiryonetim.com/uploads/file/jakevokufubomedub.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/10f9881286c284c1e66203d875ee2f63/xozalulodu.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c08dcca86df---1197832708.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea003aef7a---murokojazovurazezup.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/33130653199.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be4069d5f8b---pevefiserofemi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=create+a+game+using+javaPDF 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_off00010959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10959 17724 bytes
SHA-256: 7f18a82cd1311612f27917cb5f0329c30e7939f1a45f92f261061bc8270e9804
font_01_sfnt_off00013818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13818 10612 bytes
SHA-256: 8ff0ee84e090e0b3abdffd9f5b815d4119ee41af5c4ad5ad47f31f4615c6d340
font_02_sfnt_off0001505c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1505C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1