Malicious PDF — malware analysis report

Static analysis result for SHA-256 1485f849b7b8fa38…

MALICIOUS

PDF

98.3 KB Created: 2021-07-06 22:42:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e221e6bc27b4ba8cba45190b78badf1b SHA-1: f0dcc86b1fa17b06662bdb95cbd0f0c3a4a77812 SHA-256: 1485f849b7b8fa38fcec121e60558bab54c27471a97c20d47daa09423e5e55de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The document contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to redirect users to malicious content. While no scripts were directly extracted, the nature of the link farm and the ML classifier output indicate a high likelihood of malicious intent, possibly involving a phishing or malware delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9784

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 http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/7dc22dad29804531c6dccab8a43bba28/16161814358.pdf In PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b98dc5bd75c---46105707395.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/dopepikedabeditapuzuget.pdfIn PDF document text
    • https://tempatpasang.com/contents//files/33619673681.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608559e76346d---tijolanasikulowunux.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/75190696742.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/32756897787.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210528035949.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608727cc3fac0---7720683721.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/80641345482.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/5980852761.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/nau4cb7543h9vk5pee42igpv9b/14919657888.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/95427883782.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/6547126781.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/wamol.pdfIn PDF document text
    • http://valifyrepapillon.com/clients/6/68/68e1c6a84db99a04c21676ff826d6e37/File/jigabipokajimoviribosone.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c5dcbd1340a---5342450143.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/5cac4c0ca15777cfca008543a85aa82c/73428614692.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/26292090065.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160742e6dce5d7---nisefasozatanugumepelugev.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/e6a6de799e54a275bc7d2368e87d0467/vesugavaluraparur.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/36626745078.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210627120758.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/99123310385.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/jjfs3218tgs3quvhm82bn823i7/46521670713.pdfIn PDF document text
    • http://schokobrunnen.com/idata/38929511973.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210609152249103.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=ford+stick+shift+carsPDF 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_off00011edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDC 17348 bytes
SHA-256: 3d10e95f6579df848162b950ab2bc920cc53c4f0308fbb677bb2f327c0bed29c
font_01_sfnt_off00014c60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C60 10360 bytes
SHA-256: 21d71fcf61a16761d7ac4ee1480aedbcc42bd69cff89394119c3c764590b5a22
font_02_sfnt_off000163e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1