Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac319819bed890c7…

MALICIOUS

PDF

70.3 KB Created: 2021-09-12 17:37:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 3cfdfacf8e09ab4fe6f0c38e4b24f860 SHA-1: bddb68eb86e067b3d4b311e3af99a30b473879c5 SHA-256: ac319819bed890c7d5237aeb49cdbc969afe19aa8c35c983247936dc2078dd31
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as a malicious PDF by ClamAV. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on potentially compromised CMS uploads. The embedded URLs and the nature of the heuristics suggest an attempt to trick users into visiting malicious sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4905

Heuristics 5

  • 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
  • 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://haohanlegend.com/Uploadfiles/files/bebapimo.pdf In PDF document text
    • http://strandedtattoo.com/file/bidizazamir.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/78922144523.pdfIn PDF document text
    • http://surausa.com/uploads/files/jemasilitojos.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/40366213745.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/firigawe.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/12494465788.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613150e358e9f---nokizutidanerebow.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/86734627547.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/sudavikukas.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fe8aa155a---42156199937.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/38599405411.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/xavokali.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/38272546592.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/91070060145.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109020530291617.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/xifoni.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/76564695824.pdfIn PDF document text
    • http://law885995.com/upload/fckimages/file/fimajutazujejelet.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/somozumosuzogunat.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138b212162ca---86045292879.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/93339669423.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/84574124026.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=photoshop+2017+torrentPDF link annotation
    • 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_off0000bc11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD428 10392 bytes
SHA-256: ebfc9d49d86bb393d6a649083f5a0ec51f2e608cc917342e79e1b6f2fe63f366
font_02_sfnt_off0000ebc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC0 19016 bytes
SHA-256: 1632fa8f04f80fc4e915ea3d53131a70d304adb0de0b10233d1869a6589609a1