Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b4dabb93b4e147d…

MALICIOUS

PDF

96.8 KB Created: 2021-08-14 21:45:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1aa4373407b975afbdc9c076e1b8f2a8 SHA-1: f97ad820b409866d2453d0823d887ca520c150a0 SHA-256: 3b4dabb93b4e147db7a66739a56a54372caeff67e8ae11d038ce7b3239ba3f40
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple potentially compromised websites, including those hosted on WordPress upload storage. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/ccfca3t2pls1h1naiqq6cl674f/19404440687.pdf In PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/5a1f1fcf2e980ee3c8fa6644e4b5f43f/57232561635.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/bimitexoj.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bff961f383c---17222674241.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/44d3474227b52ce42e603b56a10923aa/lenebu.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/74325746268.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/63455722912.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/82554215503.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/povopobamonuzis.pdfIn PDF document text
    • http://labsshop.com/d/files/wewawejid.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/1965614e1d9884d653cac67640237bae/wunawukawixolufigol.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160978c5829de8---54330992062.pdfIn PDF document text
    • http://centronegozi.com/public/jafezom.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/weper.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b4dde9ecc---69627120173.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1610d1b89c0dee---fobomazin.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a9e4519f5---poxemil.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/pevutolunipug.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/bulesuromanamutiwubipuvi.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/8571120763.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/9f8a688daad795929eb287614c87d135/lolenewelo.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202105141823526098.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/93464054138.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c7ec53766---jududetopanoxenod.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/lanolijazupitob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=physical+appearance+plays+a+minimal+role+in+nonverbal+communicationPDF 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_off000115aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AA 11060 bytes
SHA-256: c17d87daa7554a7ca8d76dd37e66bd3fc8727a9f073125f709f1fa68bfb077c5
font_01_sfnt_off00012f13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F13 17200 bytes
SHA-256: 12bcdda56a1ed26d2e614a1c58734eda6aa5d078c3f11f12d279e04de1ef1ab4
font_02_sfnt_off00015bc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1