Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6822ced73397047…

MALICIOUS

PDF

82.1 KB Created: 2021-09-09 04:33:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1563b88f6e3cf2df17e35b705f9476b2 SHA-1: 7ec4a4f5b89fef200cdfde479d8f6650af5c6dcb SHA-256: b6822ced733970479c541ade644758bd16a5ad6704c95201b88f85c0bb0927bb
156 Risk Score

Malware Insights

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

The PDF file contains a link farm, as indicated by multiple heuristics and extracted URLs pointing to various domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of numerous links on potentially compromised or disposable hosting services further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://ovecollection.com/royal/admin/images/products/file/jekerolemasadejagomi.pdf In PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/kagut.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/75359874571.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/daxedu.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135377d4124d---xowetepibajam.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/xujukafufewolipatozovogu.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/2073975344.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/11157825575.pdfIn PDF document text
    • http://solee56.com/ckfinder/userfiles/files/18305122509.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/26906711856.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/1144340878.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/36183474373.pdfIn PDF document text
    • https://euronuts2009.ge/files/files/fosometuduvolanoxixifi.pdfIn PDF document text
    • http://arsvet.ru/img/upload/pawunuv.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/161377c22963d9---18523378654.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/161391c8a015de---waxututu.pdfIn PDF document text
    • https://rumputhijau.com/contents/files/69324487775.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/durexofawiwifolapifewot.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/pchfcr9brr9sut5hadn1sfnlo4/16758713767.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/95540464499.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/29898967554.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/dirubutabenagerur.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132312e66db9---feguxu.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/wogafejuzolazixo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=great+gatsby+sparknotesPDF 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_off0000dd7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7A 10672 bytes
SHA-256: 4c71551ec1e63a1844cafd701c5743847ed3a220cdfe0a51f3039a63c100ad15
font_01_sfnt_off0000f5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E09 17540 bytes
SHA-256: 4f6bf71fb6a704d17433ae0d72cbebb441719b87800767ac8dd8898bcf7c65c9

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