Malicious PDF — malware analysis report

Static analysis result for SHA-256 95ec473bba618bf5…

MALICIOUS

PDF

85.2 KB Created: 2021-09-02 19:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d4994cfe03d6034dcd7b662adf185683 SHA-1: e736a2b17170a65fd5662eb13f9ba7aa0b803399 SHA-256: 95ec473bba618bf53a5ae13eaff0b06a2f02b951826e40936d8d7cdee74dbf28
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to compromised websites or disposable hosting. The ML classifier strongly indicates maliciousness, and the link farm structure suggests an attempt to drive traffic to potentially malicious sites or to manipulate search engine rankings. No scripts were extracted, but the overall structure and URL analysis point to a phishing or traffic-driving campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://mk-sito.it/uploads/file/15305959933.pdf In PDF document text
    • https://pmfegypt.com/userfiles/files/kazulub.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/23091861221.pdfIn PDF document text
    • https://sayurhijau.com/contents//files/63701236035.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607620c43bb06---71108910247.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/zekamasitutiloruxa.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/abce89c4b87c6a55ceeea992736ca80f/godusizuzeneberaloruj.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/74954181068.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611fab6ac7ec7---52602508487.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/0560b02c4208eae13a2cffb533082c48/jipujujopumaruse.pdfIn PDF document text
    • http://18554080.com/userfiles/file/29040374341.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/58766853736.pdfIn PDF document text
    • http://togetherwewalkny.org/clients/2/24/2411cc079aa0f0d7fd57f81c6163ecfd/File/gewuruxedibetodagetamenut.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086bafd8bfbe---43015935564.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/325257cd9815426cc0b14f21dbf6136d/zobupetuzawitufivoraz.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16262092559.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/cc981c9a974f4b7b135f9237796bfaa6/torivupejubosotarob.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/10376708904.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/dorafa.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/22098126549.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/4b52c8dd9d1d51fc6f72e22279511f90/duwoxoxojedofusado.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/4fed091fb69d7f3f6ff6873b2a2cb209/62978751086.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=pico+vape+mod+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_off0000e405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE405 19876 bytes
SHA-256: 8b193ae158830928350f7fa4cd1da77ec9aaf5e5f0e601ee8007ae873b562f58
font_01_sfnt_off0001175e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F75 10476 bytes
SHA-256: def8df7cdca92ed84f13c7a12cdf12f204519157afc1c73f60e70a08d2950222

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