Malicious PDF — malware analysis report

Static analysis result for SHA-256 67423f2f5f944642…

MALICIOUS

PDF

126.3 KB Created: 2021-09-06 09:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bc2fe99e40fea565994cdefa89170c7a SHA-1: bf1a989d452ac90ceb50c9cc09cb4cb14a008cd9 SHA-256: 67423f2f5f9446420a617f91a8fd422ac023e8f5df9e1185457e3ac08514d3ec
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm hosted on compromised WordPress sites, directing users to download further PDF files. The ML classifier strongly indicates malicious intent, and the structure suggests a lure to download potentially malicious second-stage content. No scripts were extracted, but the overall pattern is consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 5

  • 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://laborke.ru/uplcv?utm_term=gravity%27s+kiss+the+detection+of+gravitational+waves+pdf PDF link annotation
    • http://wuxihemei.com/ckfinder/userfiles/files/20210718_111937.pdfIn PDF document text
    • http://asustainable.com/global/file/nukukevisusivi.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/xedegu.pdfIn PDF document text
    • http://tomnhenryanderson.com/clients/8/8a/8a1068334c160bb49438aafe8043afff/File/52060984697.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/49f4acf9c08f1431c853bd663c3cf0de/nekobufanamavelefaro.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/41385139838.pdfIn PDF document text
    • https://bamor.org/userfiles/file/75069211354.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/45592450933.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7650d703d---48215334921.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2f1aabaa0---43135190758.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/54683408183.pdfIn PDF document text
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/77659907930.pdfIn PDF document text
    • http://novichiha.ru/pic/file/golixijazu.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/9d760d44103467ab674c2c00148285f0/tawugulodu.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/fb904bf7a15a1bf890b318b45380844d/jevojanifumawit.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608012b62a912---99001588996.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/kasaputazulexegad.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202108270625306689.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160876f8a2ad8f---17590109645.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/xetopaxijadumew.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/rikekudelol.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/suminatum.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/31312715883.pdfIn PDF document text
    • http://capitalclassof1971.com/clients/4/4c/4c1e4f015ba9b8bec237dc1ca705466d/File/88546969974.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_off00018168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18168 11328 bytes
SHA-256: a189c35edb51c83d5887d795fdc7fd3b1ec6670202fbe745c92edb4e8f6ff449
font_01_sfnt_off00019bf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19BF8 20076 bytes
SHA-256: 612e836c7fa821176fb99a699145194bfaf80f375927d891ab4dd11ef4a29ccf
font_02_sfnt_off0001d135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D135 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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