Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5dde01dc3829bd0…

MALICIOUS

PDF

76.3 KB Created: 2021-09-06 05:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 19441070b4233b8a6ecfc65b0db363fe SHA-1: d0916071484376008726bd571da65e20d794f563 SHA-256: d5dde01dc3829bd0f40c1877a89fc84cb6632f8008e501c0c724033a8b76a096
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, directing users to multiple compromised websites hosted on various domains. These links are likely intended to facilitate phishing attacks or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7d69087b8---15924479730.pdf In PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6093930f93---4814174033.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/77081949464.pdfIn PDF document text
    • http://robbes.nl/media/files/fozugoxezo.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c94a4fa1f7a---3008862809.pdfIn PDF document text
    • http://agmapure.com/upload/files/jujijebarepiwafadikexirew.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/zekisivejuvo.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/62306422910.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/sonuzezurejesevom.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/77908448588.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///46930152384.pdfIn PDF document text
    • https://saam.vn/images/content/file/dixotavikenelenirusojapan.pdfIn PDF document text
    • https://buka.ru/sadm_files/kedunipajujejoxebilumere.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/2288121102.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/vofiroliraru.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/79579424148.pdfIn PDF document text
    • http://sport-way.ru/img/file/25111159847.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/nazutadupumiwevefu.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/26855928826.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/7490294833.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/52327672911.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/labobukavimaruzujuxiv.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/76850822252.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/82247471295.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=dictionary+oxford+ilustrado+pdfPDF 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_off0000c1b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C2 18768 bytes
SHA-256: 6bc750c4829b8d8593f6874c1d6265a11c1e5356ac3613ba51a3d2acdf8673e2
font_02_sfnt_off00010a27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A27 10800 bytes
SHA-256: f73eb01d063dfa7a44198f6672ece113d20643dfd0084deac0d76886338b8bbc