Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f049557e0376ffc…

MALICIOUS

PDF

74.1 KB Created: 2021-10-13 14:37:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 977ff851538316cbc09f0a67fd1fd2c6 SHA-1: 6ad17bcd61f35f4b1c8b90ae2606d3ce928ee437 SHA-256: 0f049557e0376ffc9be9cb322f4275702f9067cb3c7e71e45896bf54a28646c8
96 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting sites, suggesting an attempt to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the structure aligns with a common tactic of using compromised sites to host and redirect to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://fleschimmo.lu/userfiles/files/limak.pdf In PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16151e3ae7d0f7---geguzekisunimixorufupivix.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/womimome.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153c5bcd4527---sekifatuf.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161512fb830ca4---suribobekulidu.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161484f33e1b07---lenufiwifaf.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/62295363324.pdfIn PDF document text
    • http://seowonbattery.com/files/fckeditor/file/19075535116131dbb292b38.pdfIn PDF document text
    • http://pasted-radio.de/web/files/65445012686.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/guranirabemeravode.pdfIn PDF document text
    • http://vejwun.cz/images/7349646569.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/48234815614.pdfIn PDF document text
    • https://ekinyalitim.com/depo/sayfaresim/file/62773813943.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/37857119810.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131f3e2424a7---renelajapida.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615a65244732e---tijokurikujanaperixu.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/woderafekobixusokopapewo.pdfIn PDF document text
    • https://cowik.pl/upload/nazogarativamos.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/35bc1c2fe0f5d7b07f280b4435e6fa3f/19237350704.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/jemoguwusa.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/12566584190.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/98924827508.pdfIn PDF document text
    • http://hmsendo.pl/uploads/editor/file/80056435877.pdfIn PDF document text
    • http://tnhmc.com/userfiles/file/28207486696.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/RhDyTiV0TgQ/uplcv?utm_term=how+to+program+cablevision+remote+to+tvPDF 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_off0000bf61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF61 11000 bytes
SHA-256: d2d2fe7bac4786f6d615818c155414313d0d98ab226e4e0397f48ab486527bf4
font_01_sfnt_off0000d8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C2 16500 bytes
SHA-256: 467a9cf552faff0fa66613e8591a5135f01d6f00bedd231dad9a108f98dcfc40
font_02_sfnt_off000102aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1