Malicious PDF — malware analysis report

Static analysis result for SHA-256 8608c6d2130c95c3…

MALICIOUS

PDF

102.4 KB Created: 2021-09-06 18:14:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 596dd46effa5effc3008e9bb04deef26 SHA-1: ffe1679c1aeb95d908bef56d3730722f781309c2 SHA-256: 8608c6d2130c95c376ffcbde8cfda303b52d0d94f626466fe603041dd7a03042
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this document is part of a link farm designed to distribute malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. No scripts were extracted, but the structure indicates a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://pistant.ru/uplcv?utm_term=all+figures+of+speech+pdf+download PDF link annotation
    • http://baby-daycare.com/uploads//files/202108082048581335.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/lawen.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/44016862799.pdfIn PDF document text
    • http://dreamscar.eu/userfiles/file/somanukivitukurarenulasu.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/12390746182.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0039da93f4---zemopasimudonuk.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/c08c19ne73n4b99gdf6af4eivj/64211912425.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e321aac695c---33654440135.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/rh0p9tmp9hg67fqkl96a023l9p/37243358279.pdfIn PDF document text
    • http://beta-rc.com/upload/files/maxobewuzudikej.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-8-15/20210815094235911585.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/70442894918.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/29761861743.pdfIn PDF document text
    • http://wych123.com/upload/files/37945019278.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/8fc23c2fb502570b42c1015b094195b0/kuwalotariwozeb.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/lubajipu.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/guxujidizowezi.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/zeborewer.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/dokefiperovemufofes.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8f87072315---wonukalom.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c3fd61b36---wetegipoligo.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/45357480515.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/15312070956.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_off0001234f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013b66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B66 10968 bytes
SHA-256: 0d1f32be235ac2caa63d21a7e9d753ec5b92efcbcd25292cf310874940fe695e
font_02_sfnt_off000154a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154A1 20860 bytes
SHA-256: e97caad9a98c97b3f255067d216fbcaca8e2b30b3318645fe188ae55f39ad055

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