Malicious PDF — malware analysis report

Static analysis result for SHA-256 a77afce5f97ad418…

MALICIOUS

PDF

76.7 KB Created: 2021-09-24 06:27:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6e4008a7662c1221f683fbd9220da318 SHA-1: 72bd90603e8996aae031d4b17d7d6201499de7c0 SHA-256: a77afce5f97ad41878f516c930f154c06419c83804c590cab57c42b4ed5ce376
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with several pointing to compromised CMS upload directories, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and does not provide further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://portugaliaimagyarok.com/ckfinder/userfiles/files/69288250138.pdf In PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ef48e3bb2---bufiximop.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/zavikematuzizonepivuxe.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210923205745.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16139e8b21c9ff---vijenimorixiwewel.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/97601122631.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/22298d897619a041f67170404a492dfd/tenoxulatur.pdfIn PDF document text
    • http://anpo.vn/upload/files/tupijematefi.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/61764474729.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/33107160825.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16135c8712fe1d---dodusezojojiwofugavunos.pdfIn PDF document text
    • http://hladonural.ru/upload_picture/gibunurizepotafagogabak.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/varosiroka.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/1388258011.pdfIn PDF document text
    • https://kildevangen.dk/files/zekem.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/4617562361.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d14701443a---fisebuwibodemibadid.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202109210631001276.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/28540872548.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/53917718625.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/ranas.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/seleniguwexugaxipu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=clean+master+2015PDF 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_off0000c318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC318 10516 bytes
SHA-256: dfd679c621002e8be9cebddc6c699055ad85fb5d41d3a9ad44dd316fe87e0d38
font_01_sfnt_off0000db2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2E 19900 bytes
SHA-256: 762dbdbcfbfc6d55ad4ac6491e48840fecd689a9127349ccd299c4438fb0478d
font_02_sfnt_off00010d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1