Malicious PDF — malware analysis report

Static analysis result for SHA-256 72b51a90df5de362…

MALICIOUS

PDF

101.6 KB Created: 2021-06-29 17:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eede4972767f758bd1e1e03ba53e6faa SHA-1: 1366df6ff884f24c9182759e6bf1ec95cff13462 SHA-256: 72b51a90df5de362ac51d399abf732aa6860bbc7317017f7dd3c246cc42cf0a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure points to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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://wastran.ru/uplcv?utm_term=the+definition+of+furtive
    • http://ziconiavip.com/uploadfck/file/nuvojulokevupunig.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/74vpd7hrgthk56hbbp4gjk2eut/94185577309.pdf
    • http://europavloeren.nl/siteimages/file/wezuvidamobig.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607060666e1ef---17101163160.pdf
    • http://africanhairbraidingsalon.com/userfiles/file/watujak.pdf
    • http://supermarketdv.ru/files/file/zelulozeza.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b107097965b---26350387144.pdf
    • http://hurtmar.pl/Upload/file/sudasenosupojuxog.pdf
    • http://bezagsecurity.cz/userfiles/nifobabadaxuwixogi.pdf
    • http://trimblehighalumni.com/clients/84492/File/41161570827.pdf
    • http://cl-pub.com/files/files/56733457635.pdf
    • http://razaviota.ir/basefile/razaviotair/files/80801584773.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/f5a61d7468c41a91a472aa131701f22d/83054864480.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bbfe0222580---1366707825.pdf
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/126e6b097f2daa251244788722c408da/mekunetuxajawameguvate.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609b906061a6a---46335808377.pdf
    • http://ricarda-allegra.de/userfiles/file/guxotopodemida.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160986a2b88023---87926737914.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160731a026f23b---75235166897.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/9pla0o9pd8a8maa1i28eopmn83/43217133740.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b183f1b5fb3---4234118278.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/j3sifko4fp5c9mahi1m8i2bkg7/sibavojezunewotisa.pdf
    • https://schmitz.cz/res/file/joxaraduwujari.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e66c595b7---348684118.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/a188981d3736968246ed3417d227c1fd/84055078620.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
font_00_sfnt_off00010bfb.bin
028bb7487a859bbd4ef403d832c66196aeea123d503f3eac1cd56f6235149d57
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFB 10204 bytes
font_01_sfnt_off000122c5.bin
0c9c9c073aed19b4e492907260b8631887d8a8c7de88fef1c6a9594c0b872fdf
pdf-font-stream PDF embedded font (sfnt) at offset 0x122C5 21080 bytes
font_02_sfnt_off000158f2.bin
f09508604c12d251d16cccab42194b0ec894d96ea9f34a01ef5bfa415d5619cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x158F2 16708 bytes
font_03_sfnt_off0001709f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1709F 16792 bytes