Malicious PDF — malware analysis report

Static analysis result for SHA-256 732ba95555dc48a4…

MALICIOUS

PDF

89.3 KB Created: 2021-08-09 10:19:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0b7539f75c75c8c0ebffa2572a390862 SHA-1: 77e6288f2d3457aaafe590758aa63b3a95aa8431 SHA-256: 732ba95555dc48a46e9d30b168479c02ec18ef956b214dbc9a51c12985aac43b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to numerous compromised websites, likely to host malicious content or phishing pages. The presence of a 'download button' lure further supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://yourhealthyanswer.com/ckfinder/userfiles/files/vawibadiwedikujifirix.pdf In PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160719421785e8---34909871822.pdfIn PDF document text
    • http://coronado1977.com/clients/54390/File/ramunodagejafatozu.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/sp7qrtiammaaredt317963ttgs/87634416017.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/9r94349q26caussvc1j4f2gdcp/1784461374.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/pojara.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/pukikomokimubit.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/repovamazoneluxu.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/99824714560.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/7c3319011136c8e78e124f70159dd788/botanivarisaf.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/tlvvmgth0fcann6ft2iaka8gn5/japowipugaxifibo.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/muzelajazorejedi.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/8c90c5296173aae7f368d710c3b5679a/guguj.pdfIn PDF document text
    • http://vincentpopetutoring.com/clients/d/dd/dd6b7bcf94cac99d3bed97cf8166637b/File/53667683996.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/tivubasoliminip.pdfIn PDF document text
    • http://garystrike.com/clients/3/30/301ae0ed988f9237e4cb8f8c41f6cb36/File/fotazotiwujuwetuxiloromuj.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/2c6021e58933031ddbd662d8bd42785e/66003504013.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/50f4fb33d184b55842b2b5683cfa7717/fapukokutukeven.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb397c3f31---14380984800.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/gerijiwamigasetegoxox.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/fejole.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/9108098979.pdfIn PDF document text
    • https://gregor-biffiger.ch/userfiles/file/31771079120.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/3610962505.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160952e40249d1---87150588675.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/8572245671.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=slots+era+cheats+iphonePDF 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_off0000fb45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB45 10544 bytes
SHA-256: 2baa1426fc548d0bd8365fe054bfd8235941614b35b95d1773212205481f8918
font_01_sfnt_off00011337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11337 16884 bytes
SHA-256: dcd2dea8a7e0f1e9f115239b1b5967e54636a25ffdb3f1870a620d0eb52827a2
font_02_sfnt_off00013ec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1