Malicious PDF — malware analysis report

Static analysis result for SHA-256 84a83e25bfecfaff…

MALICIOUS

PDF

79.2 KB Created: 2021-09-20 08:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ce8b736b5d6741cf5104f024f848a4ef SHA-1: d7eacc5f8100566a39722130c423dc1543c6f719 SHA-256: 84a83e25bfecfaffc216a22c9371c18621d477799b2174bf9c2819d5c42bf542
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for delivering malicious content. The heuristics indicate it's a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to disguise malicious download links. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature, likely aiming to trick users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://hospvetcentral.pt/site/upload/file/35471420695.pdf In PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/pedezosumulole.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/30928689475.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/5900421359.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/31041577217.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/vasofududererigabokaj.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/gasiwotarigosefud.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/9600564833.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/70199267497.pdfIn PDF document text
    • http://highgaincomposites.com/img/file/2021917125431.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613875a7a35f6---fifebuz.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/94877607361.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/vowup.pdfIn PDF document text
    • http://lmtechsolution.com/userfiles/peraragimon.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/91066053763.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/12907274749.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/f6abb8e5c8b84abc2c42bec91478fae7/46797934136.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/fipaked.pdfIn PDF document text
    • https://swiz.eu/files/editor/lakozu.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/6149301077.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/51008110933.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/16578724361.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/kkt0ba9kepto3qjvttlduvlfgg/42197640577.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/40378829459.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=windows+media+movie+maker+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_off0000d371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD371 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB88 10548 bytes
SHA-256: a93234ede848548fd31a39bd46ec5d8628b827f067ea2b24096fd9275f510b18
font_02_sfnt_off0001038f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038F 16932 bytes
SHA-256: f246f41c1bb0d15841388ccb7371ee7a05a3de95aebe3cb66fe95ffb00d6596d

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