Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a95fbdebc872bf1…

MALICIOUS

PDF

82.7 KB Created: 2021-09-03 07:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ed39576fec7084371186d31e0656ce33 SHA-1: 8728757c0bfc1e276a9b3b9a6670392adb338cd2 SHA-256: 2a95fbdebc872bf1522217430ecaae3975113efaceada4cb5da261cc18ad1d5a
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on various domains. Several heuristics indicate this is a link farm, with some links pointing to compromised CMS upload directories. The ML classifier strongly suggests maliciousness. While no scripts were extracted, the structure and URL patterns are indicative of a distribution mechanism for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nemdanangpho.com/uploads/2021-06-29/images/files/17849807490.pdf In PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/a68ba28c422b03dc27e66a494114f9fd/zudaf.pdfIn PDF document text
    • http://hcwan.com/userfiles/file/vidojakobepax.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/safel.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/dufavexe.pdfIn PDF document text
    • http://dhf-china.com/d/files/39139388546.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/49724d698360b79f929783db1c6249ca/niweresazugegubamobinelo.pdfIn PDF document text
    • https://gestionarival.com/userfiles/file/47612406516.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/83845534666.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/jogomagerixawutusowaxe.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a46b7aadc4c---nunoruseparaniz.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/1hn8ti7kjuufr52g18c70ve5mv/lalubovaromesorazukemuba.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/7c868467dc6eddc516d56e43d8ddcd8d/tufajubusurulagilo.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a418b991e82---texubagijo.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/61848465092.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa819aafb08---26885085012.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/51707128206.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/3d8aff641b7cd655cb6262c584c5bb6f/ziwigepi.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/rosorupikej.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/95524988601.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3e9cc7c57---83417776530.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/lugogu.pdfIn PDF document text
    • http://wagnerfamilyreunion.com/clients/866685/File/xusoviwazez.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/87450576197.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/tovobukonavateresiref.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=superintelligence+book+free+pdfPDF 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_off0000de93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE93 10872 bytes
SHA-256: 86353a4dc08e2c04579f148868c1ecd065c7797285430e3ffddca74e50617664
font_01_sfnt_off0000f760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF760 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F72 17464 bytes
SHA-256: e9fd56f6de3c9ea6055bc971a2abc0d8423e26d74cf08e6bd7f02336d8bc1610

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