Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2f8f28e482e36a2…

MALICIOUS

PDF

83.5 KB Created: 2021-09-07 02:11:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3101cc4205b02b53f249c10dc99e3dd0 SHA-1: 9adb866d5de53c244357e8726314b367287c084a SHA-256: e2f8f28e482e36a2c24a07726e4044ce8fc3b72926fa33bb9ebf48e015a54459
96 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to obscure the ultimate destination. The ML classifier strongly indicated maliciousness, and the presence of these link farms is a common tactic for distributing malware or phishing lures. No scripts were extracted, but the structure and heuristics point to a malicious document intended to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a952a0a64eb---boxuwapepozokugilaribo.pdf In PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/63288013274.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/579d60a1bdb8c1b338ac14c13067da1c/66983060459.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/d75f52f7cc7fde7dfb77e7cddc0ca3df/89641763766.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ochpplc5ea32nj7psdcs0q4e5n/kugemevewomofuwi.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/xebevu.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/povixubeduzujonafilejimoz.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607da381b85f9---43250792909.pdfIn PDF document text
    • http://standrewsparishhighschoolclassof1964.com/clients/70428/File/10163526150.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/36480763558.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/47099735074.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/9321168466.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160747b44c6c9a---rawemapuzaj.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/40874153525.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/71043885198.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/66983896631.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/xilujubejalofirijurera.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/jolonuti.pdfIn PDF document text
    • http://devison-matras.com/upload/file/77760964465.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7f07c425e7---46741273013.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609268dbc1cd5---siwino.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/160856390761207ea51751d.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lewigojoxupopabenax.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/29994991987.pdfIn PDF document text
    • https://facades-metal.ch/ckfinder/userfiles/files/sepomuwaw.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/95011144962.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=grandstream+wp820+manualPDF 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_off0000d7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D5 21148 bytes
SHA-256: a65b0523e6eee72f29eab1b07d3304af19048f2a4548358d4d907b8227ea5f0c
font_01_sfnt_off00010eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C3 11016 bytes
SHA-256: 076693e56f9c553249fb4884b262e22e3f92cb50dbd0ecfd87227e09dcbc24e0

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