Malicious PDF — malware analysis report

Static analysis result for SHA-256 87817f7a38dce8a1…

MALICIOUS

PDF

88.0 KB Created: 2021-07-16 11:37:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 65e5b98dcac7c11db8a00adc4179f005 SHA-1: 6cc49535d1c9eab4326614e06153ce8c491d7963 SHA-256: 87817f7a38dce8a138c77eb6e19d90e2a2c7b9c327e5cdab9a24bb1a17d9278d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. The presence of embedded JavaScript suggests an attempt to execute code, potentially for further exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://lohs69.com/clients/82366/File/54439415027.pdf In PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b95ccf3dde9---rutijozuruwifewu.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609dada3abb2f---37052188045.pdfIn PDF document text
    • https://triosms.com/userfiles/file/14621527181.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/48879478602.pdfIn PDF document text
    • https://langestrand.se/anvandarbilder/204/files/65379806998.pdfIn PDF document text
    • http://mcelvain2020reunion.com/clients/b/b5/b5167212b805812c9439186484f80f5e/File/zowatugofisotebapefig.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/60422768979.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b12fd2629fd---55505041289.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/kapajer.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/2932647189.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021071601571973499.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/53760008101.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/7r392t3tslvmt9lobaoi9s1mdh/14192625961.pdfIn PDF document text
    • http://compufoxmail.com/userfiles/file/53516910193.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/jl7sispdtoh7t254elk54q6n3h/lozevapapepufexevijo.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/jafopujeti.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/480f31404278ea363ae04cb56e0cdf79/jigoroliguxidixire.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/xijafavukomimafabale.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb8d8bdc2f---solalovaxeremozadebux.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/tvdfa60fl5pbhlk0ce9mf1q6r3/gujisulazugejemolu.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/r83p7gavfpsolkqjsd75ngqnn8/pewaxusowitetubanokun.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/xejoxewe.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/zudajamowamafiraxizodudib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=dj+private+songs+mp3+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_off0000f393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF393 17096 bytes
SHA-256: 16defe116230d4b320283d0349af67e3e9d8041303b45c50d0d74fd777c18074
font_01_sfnt_off00012068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12068 11192 bytes
SHA-256: 175b6d93a0e3340777abff91250ce26dc0ff2781a5c45b5d8899256c4d8b715d
font_02_sfnt_off00013a73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1