Malicious PDF — malware analysis report

Static analysis result for SHA-256 746ddeca127e4cb8…

MALICIOUS

PDF

83.3 KB Created: 2021-09-17 03:02:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4270089981a566c36d04b331b7da8be8 SHA-1: 1f3761efe5358a2875c131fbfcbb26d9d729da9f SHA-256: 746ddeca127e4cb8150945f38d8b2019059ed828726f75dea8f2e57c00f91fbd
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://aunay-sous-auneau.fr/ckfinder/userfiles/files/42839336944.pdf In PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f93c3c0de---37194169638.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/mibuwe.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/jujuvogev.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/37333145048.pdfIn PDF document text
    • http://www.keizerco.nl/userFiles/file/rojubezixibusik.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/19973137126.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/60850540942.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210913_A4F7B7C213E9735D.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/60920144799.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/34cd6ecb4a6f603a50901ce557e76022/62081968275.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/meranakikesoxu.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/3a2ec023abd5a4c08f00dae67a0b5036/famikapisamatafusedabutam.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/17441301323.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/nonukaxomafimurino.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/xijigupabilidozogixumipaw.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/86621007479.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/71698221892.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/89992755435.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402e2bcaf74---33914776832.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/64721494433.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/luvegipazafilurazadikimow.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/rajefadazitoxeluxeninij.pdfIn PDF document text
    • http://www.culturehousesun.org/photos/file/nibijudugebasuvisis.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/nolobagunusud.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/pajibefofulobufemugi.pdfIn PDF document text
    • http://asv-solnice.cz/_files/file/sugifibakenok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=filmywap+south+movie+2018+downloadPDF 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_off0000df1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF731 17700 bytes
SHA-256: c215b3481c4699137328ec26b1d3d0ff3dba72a96872a5cdd1b21b687d06171e
font_02_sfnt_off00012476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12476 11400 bytes
SHA-256: db28d8569dc23a5a57d6c71e43a69929c25720eaba35e232141d6324b591f1c8