Malicious PDF — malware analysis report

Static analysis result for SHA-256 088c08a7e48429eb…

MALICIOUS

PDF

75.3 KB Created: 2021-09-08 21:51:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1efbbd7e02f3d3c028dcef9086add004 SHA-1: 2e3ace7b5a727db4544bc1b37abf9f5486cb2b9b SHA-256: 088c08a7e48429eb85aeff28f703acd4300f8899178ea40e056047d022b46292
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS upload storage or disposable hosting. The presence of these links suggests an attempt to redirect users to potentially malicious websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://thamdinhgiadaiquang.com/img/files/62059570547.pdf In PDF document text
    • http://rococosofa.com/files/files/47538126551.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/98341734623.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/revezugomafikara.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/sefikonutadakewawebax.pdfIn PDF document text
    • http://childprotectionindia.com/lexcyberia/userfiles/files/84117088581.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612ede3e428ed---87637212202.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/lidafemogawaxamudapeloba.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/161329cf147b41---15250614657.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/32163220791.pdfIn PDF document text
    • http://fmdscu.net/userfiles/file/wilunomejotovefufedot.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/9648214417.pdfIn PDF document text
    • http://fxlcd.com/upload/file/kexaji.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/zabagilokafer.pdfIn PDF document text
    • https://ibextrail.com/editor-images/foxerenudub.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613546724bd0d---wedumepiwotux.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/popukipolusedevili.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/54476689574.pdfIn PDF document text
    • https://masihpt2.com/contents/files/42278212232.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/86904015541.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/gonometusan.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/kafukeponepali.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109051021389508.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=dream+league+2015+modPDF 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_off0000c200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC200 17616 bytes
SHA-256: c7af0721a889936237c0913e00621d2fee96f3aad230dae6e681fd738a05bc39
font_01_sfnt_off0000efb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB4 10660 bytes
SHA-256: 32d3795152607656c3c1245eafbb339fd0218e6c56e366be181fa49f362009fc
font_02_sfnt_off00010808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10808 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1