Malicious PDF — malware analysis report

Static analysis result for SHA-256 3400a707b6f3d189…

MALICIOUS

PDF

79.5 KB Created: 2021-09-15 19:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 679a85245d66575f45688f879fd4737d SHA-1: b2cf61a72926d84f5ebfbeb8cb72df8d2c4d4c32 SHA-256: 3400a707b6f3d189733bae39b480e7d37ddd95ea623db09babe399a00488070a
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to various domains, including those hosted on compromised WordPress sites. The presence of multiple external URIs and link farm heuristics indicates an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://nistd.in/userfiles/file/busidareguju.pdf In PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/jomijofuxozi.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/s43chp6ooq8i3in8eaf47i127h/zogopobelodajozutuxojeviv.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/jarotaxoxenujijukitenatel.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614217a40ced7---18841403499.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/51527747011.pdfIn PDF document text
    • http://df-2.de/images/daten/file/fusaporefinaxabusozam.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/15323954941.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/48993799284.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/3506692089.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/99628190253.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/8473934212.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210903054236.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/vivujapovufuxisakagojav.pdfIn PDF document text
    • http://lactopad.com/uploads/files/fufebuxi.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/wofezakebatuwu.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/varuzofetodegexutup.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/xusoxopukik.pdfIn PDF document text
    • http://santeh.md/img/files/82566235592.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/c03df1e3c72eb282c2e66f0e6421ae1c/35070731745.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/476748d8b74b7c9655a7976cb12910f6/89418279487.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/revijabada.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210902_113634.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-16/20210916004606200408.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16138c8c6783be---winiguwogano.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=talking+ginger+2+mod+apkPDF 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_off0000ce37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE649 19356 bytes
SHA-256: 084a56590c0487b560d76ab86918b813ecbebc0c681b5132761a8c41b49061ef
font_02_sfnt_off000118c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C3 10644 bytes
SHA-256: 6724df06d86edd277764cc19d06febdec833d47a6e40df416b3e7bd0a5d8e2a5