Malicious PDF — malware analysis report

Static analysis result for SHA-256 1123b748f682ff47…

MALICIOUS

PDF

69.1 KB Created: 2021-09-22 20:14:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1b92795d38b3967e25c55c93527cefcc SHA-1: 131e6e7abafaa52fd8f07fd54b17f1dc692480ae SHA-256: 1123b748f682ff475957f89489b71fdc0ae96f060747b69454b3aa2a4ad4dc67
156 Risk Score

Malware Insights

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

The PDF contains numerous links to other PDF files hosted on various websites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple compromised CMS upload links further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://spbmedax.ru/sites/default/files/uploads/pegujumejan.pdf In PDF document text
    • http://islenapuntos.com/campannas/file/fomafezujifazofogakudeb.pdfIn PDF document text
    • https://longhoang.vn/upload/files/vibagisifugu.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/91031413582.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/lexemonigaranovatobasuro.pdfIn PDF document text
    • http://thaifilmind.com/UserFiles/file/womuzikal.pdfIn PDF document text
    • http://jlssj.com/qianzi/upfile/case_editor/file/26675454416.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea37384827---repinin.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/kefumezuwogojifuja.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b8e56ea46---nututimebejepafipumewexa.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/sapifeselalibed.pdfIn PDF document text
    • https://birudongker.com/contents/files/rupewimijuxojaj.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/fce5cb4c1feaf3b3715890fab687d603/wojujaleni.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/sefoxosowumetedas.pdfIn PDF document text
    • http://wamer.org/userfiles/file/23344357284.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/dunugajewa.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1f3de8779---xabekiri.pdfIn PDF document text
    • https://agermag.ro/mm/file/29729784109.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/f10c20cd9fa3630c5c0051b805bc01ab/jabeta.pdfIn PDF document text
    • http://vagyonvedelemszolnok.hu/admin/fck_upload/file/68812114879.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/tumowarixazexosubemet.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/15214877345.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec1b76b8bd---86507405290.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=krunker+hacks+aimbot+downloadPDF 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_off0000aff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC802 14868 bytes
SHA-256: 6268d3f9af5997d7b35adec709e9f30a80bc4bc5a0a978ddc0440ce81e703a47
font_02_sfnt_off0000ed5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5C 11044 bytes
SHA-256: 17d3f5a33aa6d3daed35e61af427e84b1d3601d3f783e103d322ff499ab37d61

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