Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc9da4bd8a98714e…

MALICIOUS

PDF

87.2 KB Created: 2021-06-25 19:21:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ae635f81cfdccf6e92265f2ebb36ca2b SHA-1: bca31dab996c9d92bf61f1f2060c56ddc72452c5 SHA-256: dc9da4bd8a98714e8df1af8d10682a21c1d5a1cf8cdb82a075b32b5dc7aac725
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to leverage compromised infrastructure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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
  • 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://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b790e545d2---xerajune.pdf In PDF document text
    • http://bagiez.com/userfiles/file/74796582394.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/73963697643.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/warefet.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/52238172144.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a928de1faf5---99369525432.pdfIn PDF document text
    • http://abnicum.com/files/file/woxivisivafibolagewisig.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/73168604525.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16098acfd1e342---jejeziworuv.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/a782c82c96174c058fdcdc0c07d819c6/24005838326.pdfIn PDF document text
    • http://vhshf.de/File/fixomibapipomexi.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/26792170873.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4784a0f431---muxadutewi.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16082d21050c7d---43994910424.pdfIn PDF document text
    • http://55thocscompany.com/clients/62662/File/6957856598.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ac59a7788---suzodujomasavetegonij.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/20215112156406930.pdfIn PDF document text
    • http://abpaluso.com/upload/file/bufojexomunamewusixexanor.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/178e656f9cfd6b351b08afc41848112e/wamedikusetakaj.pdfIn PDF document text
    • http://www.toptehnik.si/images/47234463354.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0b9b7d6c2---sopepimuxumuremofuji.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9d3f2b228---xagojalibadu.pdfIn PDF document text
    • http://yongqingtech.com/d/files/tajipemujukavuzulugumor.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ff802fa47---82406193295.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e62479d85---notanevisul.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/20216232059258173.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=side+to+side+mp3PDF 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_off0000f38e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA5 10388 bytes
SHA-256: 52a4d57080b1def87dd7395c0b84a173d3cb3455000edff19df33f2ac70951f3
font_02_sfnt_off0001232a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232A 16992 bytes
SHA-256: 955adb0c9365bf442c4eb9247d4b05ec02479856dfbc1e1f79024e43bc8d58a9