Malicious PDF — malware analysis report

Static analysis result for SHA-256 af189b8095360a5f…

MALICIOUS

PDF

91.0 KB Created: 2021-08-09 19:18:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ddc0f21f3f342e11ab5428eda24e3e1b SHA-1: cd0ed5be28675994b4218fabd8fcf39ca886ccd6 SHA-256: af189b8095360a5f37edc2d52a8e45e156e44600d07c6d61c8f0685e6504b8ff
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 compromised websites or domains used for link farming. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this PDF is part of a link farm strategy, potentially to distribute malware or engage in SEO manipulation. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://catamma.ru/uplcv?utm_term=how+to+learn+cfop+easy PDF link annotation
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23503018448.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a0726463455---fodegajemo.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/51912433662.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/77209687282.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f4fc2790d---11397995735.pdfIn PDF document text
    • http://temple.mo/userfiles/file/7621046236.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/49660893368.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/25285892712.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/a515101b5b7a29124b68799fdce54b90/getimetoduritolib.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/655635488.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/45092ce14c181636e39f5276cfacfc74/fajinivisevapas.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a8fa86589---74867664498.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b9ca3e0c0---81932119575.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/94814288348.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/71935723502.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/gevosilabowolon.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/81793385d1750bdd5537e5cd1fe9a6cd/85737117250.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/312a2350f148c0395b04eb14844f4af1/51263794644.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/61323031589.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/weteto.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/64505683558.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kidekajaf.pdfIn PDF document text
    • http://laboratorioshamalab.com/userfiles/file/13575397086.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/e0f54c1d636b267e7bea54533836cbc3/xadewowu.pdfIn PDF document text
    • 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_off00010138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10138 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001194a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194A 17252 bytes
SHA-256: 87eef4cfcc6b4f23009aece56160df9129a2261c61a053a6e3fda19d950b81e0
font_02_sfnt_off00014689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14689 10572 bytes
SHA-256: 28c9666628676cbbdb54b2748e49c8c32ed0ce40597116fd6c28d30c6ed32bfb