Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff7d6d8444fb93e3…

MALICIOUS

PDF

77.4 KB Created: 2021-09-04 00:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4885eae4b99b688bd2d983c8898efb90 SHA-1: e957f01e98c7cc11adcc8df0a8eaebeec8147604 SHA-256: ff7d6d8444fb93e3da34dc83b628ae473f93e23a37aa743f3d07059c86d010bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Several heuristics identified the PDF as a link farm hosted on compromised websites, suggesting it's part of a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca5e5caf98---34328292451.pdf In PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/a3ba6d9c1e74700aac521c64dc96d018/poxagupujulajelejuk.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/bujujakunizenu.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/xorokolomofekojopifi.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947a3086327---lijimononimamulabupenad.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a8da79479c4---bavalu.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4af8222ef3---91948847238.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/015a2011de4548ffba6939cd154bf75a/safagetezelavewenu.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160cd32c636289---rojidujoxunojenufagerex.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/lelonakivakatowipa.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/girikafirat.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb45170d166---najubepu.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/8374b3d7ccdff310b862010b326c93af/66605016660.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/67687686243.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/37801789164.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c805b9946e---dudofuxufonezumuzopejeju.pdfIn PDF document text
    • http://2rent.gr/userfiles/file/26182995891.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/84060287668.pdfIn PDF document text
    • https://kvizek.hu/ckfinder/userfiles/files/zabepamajezufirunef.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/17ff74ed1bf5aa44290ed415b7f97d11/56155352697.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/jifowurilexawofutif.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/07/22/nedomeximu.pdfIn PDF document text
    • http://alexsrmenchion.com/clients/b/bf/bf5401b25fe3457642f5a6f1150d5537/File/51679787758.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/jugav.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/75789197253.pdfIn PDF document text
    • http://haki.vn/uploads/files/funuviliwoxised.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=high+modality+words+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_off0000cb0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE324 10900 bytes
SHA-256: 8daa0e4edde65ed597544e38a7a6aae2ae9d1ef6d4133670169470ddeda55d5a
font_02_sfnt_off0000fc25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC25 16884 bytes
SHA-256: f77c563cadcb0859a1d997873523beebffaedbeacfb7dd45587ff3fe9e2993a8