Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab5b810ba35acd44…

MALICIOUS

PDF

90.0 KB Created: 2021-07-06 01:17:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b492391e348c62f9b4906a113228e158 SHA-1: 87f6e8626b3318d75d93f60789a9d4dd64569e6e SHA-256: ab5b810ba35acd44257331003f114804c069e49680c9d699ad2abf5d9ebd55e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://coretry.ru/uplcv?utm_term=animals+in+the+phylum+platyhelminthes
    • http://sity-luxe.ru/userfiles/file/suxutulidisaga.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/2d8f076531aca0b46ca5a22fa354c159/vizorimiroguxezorozitali.pdf
    • https://stiff.pl/ckfinder/userfiles/files/nibag.pdf
    • http://jirehenl.com/userfiles/file/190346596393.pdf
    • http://olsztyntransportmedyczny.pl/userfiles/file/13351375880.pdf
    • http://imhome-listings.com/userfiles/files/57767531667.pdf
    • http://cuatudongnhatrang.com/uploads/files/risezo.pdf
    • http://astro2sphere.com/admin/images/file/poletetegan.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079255fbeb91---15472550530.pdf
    • http://womensmentalhealthmd.com/clients/9/9a/9a9ccad1be43d50cbc9928f06550b956/File/zovewuribavabisefene.pdf
    • http://hrdiborice.cz/erucom1/files/files/liwekiredesap.pdf
    • http://sungsam.net/userData/board/file/65229818034.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d50063256---luzubasubob.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd8056bd84---batubaderewopusidex.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bda2759aeca---nunulibozelufovivefal.pdf
    • http://mysistermyfriendministries.org/clients/85776/File/mepakikatunude.pdf
    • http://vodnik48.ru/content/file/7202971243.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160950f575b493---7963878882.pdf
    • https://twr1115.net/files/fckeditor/file/75863022647.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/n2c3ncvfk3n4j281p83mqk38h5/61200208325.pdf
    • http://lhs75aa.org/clients/0/08/08eb77d093c5251d787cf05842b4a73c/File/14408459073.pdf
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12377774942.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100e3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x100E3 16792 bytes
font_01_sfnt_off000118f5.bin
bcf95cba271d2940da94c7079a7a8d39c072e7ade5b9cdcdc0dd42b9665d5ba3
pdf-font-stream PDF embedded font (sfnt) at offset 0x118F5 16456 bytes
font_02_sfnt_off000143ce.bin
90a8d957a7b05203a55e7b7e6ea14d1047ac6740db694d09ae55a6add164879b
pdf-font-stream PDF embedded font (sfnt) at offset 0x143CE 10492 bytes