Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f6452829f5c4b79…

MALICIOUS

PDF

84.5 KB Created: 2021-08-14 14:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 924c24e1ee38f2ef8b96ba974ddf5b4e SHA-1: 4e35caa740fecc4d679fff9cd16fcd914a73c988 SHA-256: 1f6452829f5c4b791e98331dae814e9a6c4460d9e80e263269f68ee5bc1eb16f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the structure and URL patterns are consistent with techniques used to redirect users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcaad713bf---30104433957.pdf In PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/c601c678e5b875991e2141dd69c45b0c/2507802429.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/zurogowifapukulujota.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/e4bdd1cef9c8c62dcf4dc8c72a5fa999/tajomebutat.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/gisepetojezadodisava.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b599266e83---kazuxexekifudi.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/nijikefurenonalalotejal.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/3rvmro2c1b71b2e2gv7c80hini/zobisimamamejoraxo.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b39fc8a853---pekevubonojajekaliza.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa3f94d1f9---13155326613.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/galosaxirifeluwufiwi.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/179919382.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/5539151753.pdfIn PDF document text
    • http://centronegozi.com/public/17471998968.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/zovomale.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-8/20210508141758205908.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/ramebitikan.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/98388359860.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98c084dd8---68319433217.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/guxubofaze.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609054e8bed68---22272364757.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/pipomolopisijakuzoleti.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/kuzimutojudakuves.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/mojimugisaziso.pdfIn PDF document text
    • http://vinmexindia.com/uploads/xajigataji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=ozark+trail+13x9+screen+house+instructionsPDF 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_off0000e2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FA 17384 bytes
SHA-256: b77aacfa016a8a33ac309c3f398877861aea771f12d1a04f06c8d71336d88d71
font_01_sfnt_off00011064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11064 11096 bytes
SHA-256: 10f97c8aeea96c29c060891b1b7df87c5265edd60bed740c7ba11968eddb48fb
font_02_sfnt_off00012a6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1