Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1b8b1bbc1e39f4e…

MALICIOUS

PDF

84.6 KB Created: 2021-09-05 01:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a38f2c18dd88cd3c0d041221b1d06351 SHA-1: e24ad744bfc0a7657f7b0ff916da3b3343fd212c SHA-256: d1b8b1bbc1e39f4e05c45b1d63b942da75e7eb1d58c0c2ab09b4c50100849152
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics strongly suggest the document is intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=environmental+chemistry+option+booklet+pdf PDF link annotation
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/1471f2bbb3520c255f437199325b4f78/30429085365.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/81400533eca7b71bdaf16b4b21d0a1a3/godinezegegazebifaku.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/23319300719.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/16824211765.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/1ca997352760acb382b1f1c3844de23f/27234870776.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/dazavejevalirun.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cd799a83ae9---47021372123.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d636608370---nofobufizex.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/vojavelajamejefezeji.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3e74ca2b7---pumuzemagax.pdfIn PDF document text
    • https://aspirans.com/files/file/13660765317.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/a12d0972cb29a8600f7cf9eba02629f3/55868162755.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f43f68b8f90---4411363207.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/16437554032.pdfIn PDF document text
    • http://duhochmis.com/files/uploaded/files/lemezojig.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cf508b592e9---ramogetilunumudupezep.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098b5528ee9b---suwapog.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab27845fda---vewulofus.pdfIn PDF document text
    • http://nfc.soo.jp/file/ruxuberotuvagaviwiruf.pdfIn PDF document text
    • http://apartamentosalbatros.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c05360b9bb9---xuratisoxumigapowitupalu.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/97160380618.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/7c38db39839015fb52eda9d2f5059281/xogumoj.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/rubidizi.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/84647204702.pdfIn PDF document text
    • 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_off0000e440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE440 17568 bytes
SHA-256: 587b58e610a11af26f0720fc3d0b87f6459aaf29b30624df63ad84b6e2b9febe
font_01_sfnt_off00011203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11203 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1A 11280 bytes
SHA-256: a15e18bdde3ecca62ae22ff6bbed8e74842144d8562aba40f5109f5a4c40d144

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