Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aea359fbba21580…

MALICIOUS

PDF

80.1 KB Created: 2021-09-13 11:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9e76f05662ec91366e20085ff90af0f3 SHA-1: 20faa8c2ab2354d9a6a901392e29a5c94e0312b3 SHA-256: 6aea359fbba21580d4f11df8b1f1c90654d25346d0bad6c4cf9f9d6ea3d31f8a
96 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs, several of which point to compromised CMS upload directories. The ML classifier also flagged this PDF as malicious with high confidence. The primary purpose appears to be directing users to potentially malicious or phishing content hosted on various domains, some of which are on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://pietroquatriniarchitetto.eu/userfiles/files/52214653908.pdf In PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210902_6AE1A759E27DF0D3.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/18869128332.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab8edcfdfa---lifipewig.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/06/zokodanijabefibalujop.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/42ff6862a7ce2fdc82d052783174cfa2/21754986327.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/kugununiwabajajeli.pdfIn PDF document text
    • http://hzqzg.com/d/files/70044356778.pdfIn PDF document text
    • http://portableandcool.com/files/files/569911569.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/rakimuvol.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/53205995905.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/91012081842.pdfIn PDF document text
    • https://xedulichhaiphong.vn/images/news/files/xixunigugetapi.pdfIn PDF document text
    • http://rilta.net/userfiles/files/xinuxezibubokutawinejuzo.pdfIn PDF document text
    • http://audyt.rowerowaszkola.pl/imgturysta/files/1146693032.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/50801912625.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/posudisijikuvuzoso.pdfIn PDF document text
    • https://pepsima.biz/files/file/vipojeroverozopujinapono.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/17518271086.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/2c519841759112219808f07a4730b64a/89594597163.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/9225736199.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/19444697224.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/87943903376.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/75670879160.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/649354345613e6f19c504e.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/xomatewofawatog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=war+commander+rogue+assault+hackPDF 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_off0000d24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA66 10912 bytes
SHA-256: 043c07054140bc0488ebe464401664138b32e292c68349679049ba1bef33122c
font_02_sfnt_off00010353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10353 18444 bytes
SHA-256: 4427be99957bf650b2363381b2c0f2d7d977a287d52db8495a82d405851708e6