Malicious PDF — malware analysis report

Static analysis result for SHA-256 b76175556668b51b…

MALICIOUS

PDF

70.0 KB Created: 2021-09-18 05:08:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 38970fc56b59df28e84e100a8e109f5e SHA-1: 2787acc827211a6c26229bc1e55767dafe5d0ed7 SHA-256: b76175556668b51b168b59a981d75ea116ec987366aa2d8aaa4b45e0c34372cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous external URIs pointing to various domains, some of which are hosted on compromised CMS uploads. The primary purpose appears to be directing users to potentially malicious or phishing content via these embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://crysiq.ru/uplcv?utm_term=turn+off+app+data+usage+android PDF link annotation
    • https://kvzriu.org/images/file/bages.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/gigibutojomimura.pdfIn PDF document text
    • https://esvigo.com/upload/files/15322891916.pdfIn PDF document text
    • https://www.allduniv.ac.in/ckfinder/userfiles/files/nivujaf.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/70961305680.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131211531031---lujeki.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/62729207164.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021091414598_1054596734.pdfIn PDF document text
    • http://charontrade.hu/data/file/kabibokidakemobami.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416c7aaa2bb---tejeno.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/lmhg616bjekjrelq1t0ctkough/38119898787.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/kejevijazixipi.pdfIn PDF document text
    • https://senfina.top/uploads/files/pukemiwefuj.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/29933764061.pdfIn PDF document text
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/gutok.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/nadebasetefopid.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/pijuporatirulowijuj.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/kaditogogagomakokev.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/barogaduxa.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/srvgj2a7pjcoim0fqgotn147ju/33743309622.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/19871815547.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/4jbo05habuqnfmngt9acccef4d/jaboleguwodadedozen.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/63844558376.pdfIn PDF document text
    • https://jagominum.com/contents/files/89745256456.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/l9o9863v48sme3ckkkppouc3cj/62665506462.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_off0000b4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E3 14892 bytes
SHA-256: 876c493597e1c108bda913ace6deef425495143abf5d0c23300ac2bf08404bd1
font_01_sfnt_off0000d9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D7 10692 bytes
SHA-256: 9e3f13bd99e31f3cbe4ee6ddf3929edba05f44707fe09413ea393af7975b12bc
font_02_sfnt_off0000f24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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