Malicious PDF — malware analysis report

Static analysis result for SHA-256 eebefb580a3408b9…

MALICIOUS

PDF

85.4 KB Created: 2021-09-03 13:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c28b7808095fe9d37b192ed38910ad43 SHA-1: f94215854ee0cd7681ae53556713204874e1e839 SHA-256: eebefb580a3408b9035041b4e8fb7fdf5e0cc067f3a6edef3d3177abf2e20654
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various URLs, many of which are hosted on compromised WordPress sites or disposable domains, under the guise of a 'join PDF free tool' lure. The presence of multiple external URIs and a link farm structure suggests the document is designed to redirect users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inwebjor.ru/uplcv?utm_term=join+pdf+free+tool PDF link annotation
    • https://karinbentum.nl/uploads/file/12131816271.pdfIn PDF document text
    • http://haumeaonline.com/userfiles/file/jovebajifo.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/zerirufewagafutune.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/17994367110.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/43552960620.pdfIn PDF document text
    • https://siroyensao.com/upload/files/sipemajiwupaxapomu.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/467de633214cabd1249d496d8ef6d600/63239915238.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16102db90aedd3---17169667349.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210809155229.pdfIn PDF document text
    • http://arslanemlak.come/file/2528000911.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/23555501836.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/jd4643a5cevubo1928jgcshroj/natugasowadijub.pdfIn PDF document text
    • https://red-adlay.com/upload/files/95617156918.pdfIn PDF document text
    • https://profesa.net/userFilesfile/maruvemedisomevofa.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/44318846731.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/0jmsal0kt3fbfhm9omaqfkfbj9/xavasis.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/7k7gnr5ggh8pb6j47q4d2pv2h7/71908326777.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/84205318771.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/22583186644.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7146d5834---naminiwazefelen.pdfIn PDF document text
    • http://lalinpress.com/ckfinder/userfiles/files/33333862707.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16111a28f2a20d---rineruduvox.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/upk2aohc7i53mslkqr0qkl8c20/43507943727.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16107942b181f7---vagodumifobapifipifokeg.pdfIn PDF document text
    • http://lohs69.com/clients/82366/File/fosasopigid.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161183881d6443---depobivivakudup.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_off0000e8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F6 18508 bytes
SHA-256: d71bb0eaa2d060ab77bc82d0e89ed3a3f2b4127cb9abf3c2a0276f0429811844
font_02_sfnt_off00013110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13110 10152 bytes
SHA-256: d0dba90c2dd7168af1f4b4ceee20ab577f4d24d2965ac998b1cdaadc7c94d43a

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