Malicious PDF — malware analysis report

Static analysis result for SHA-256 46a3ecb99bf10ca6…

MALICIOUS

PDF

104.7 KB Created: 2021-07-01 12:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 66eba5e233cc81c06c1b3c1285d8d9e6 SHA-1: 62d045597cab706bb38c8b48320f7a01ed3a9f0e SHA-256: 46a3ecb99bf10ca6b1a6174b042c837b425d0d4b43171f19bd2909c92613791e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm. Some of these links point to compromised WordPress installations, suggesting an attempt to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://catamma.ru/uplcv?utm_term=how+old+is+jerry+springer PDF link annotation
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/4k1a4bb3o02m2r8kmr10an8mmo/21815374765.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd98fc5835---gazuzovositut.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/93201cf61dacf013c85aa19afb514961/gamorerefufaw.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/eb018bcb2216d6c503f5b2d35ef8c7cd/63389854016.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4f331b378---42336566450.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/66456845272.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/570307ef1b32146b946ba706d9ed62e4/murijulur.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b4e01559e---35030813143.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/257c1a1a793838237d11a7c1618a3612/15773569648.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/kevasajixu.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210520134649157.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/37qe5i7sv5fo0etihh94r497c0/levegewekosijovuxezobitij.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/s4461fdq8v28qftdlolr0vafm1/60186138361.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/9doq3u871luvgi08857f51gjar/ginogavopow.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823f3a15c93---dinelo.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/zowonadalulafolib.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0aacc3f53---38590752428.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/zuwurubebobojuta.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160af97fa98d92---wunosekowibivogut.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/332206c8d4fcf4f7c191078292ce0532/38135110002.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160c72fc36648b---64633407356.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xamalovikemaxup.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/93a48bade481ddedb811aac73d3a4a54/gododitowunida.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/e8863168ad7d1b8963b7349384fc60e2/tewikikalupaverifabifi.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078dba9a129b---5049436420.pdfIn PDF document text
    • 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_off0001359f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1359F 18240 bytes
SHA-256: 7d2637a65a08a06f13f347835805b652b429437ffec08eaa2a6a0f5ebd290800
font_01_sfnt_off00016544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16544 10628 bytes
SHA-256: ff5443a1b27bff80722ddf4cc1a2594ac7dae1b11f9df3c957b481a0a4285640
font_02_sfnt_off00017d65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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