Malicious PDF — malware analysis report

Static analysis result for SHA-256 bda985cb21fe6bfb…

MALICIOUS

PDF

100.4 KB Created: 2021-07-13 09:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 07c416aa39331c2ef18c6545db4d6651 SHA-1: 4ea917180060c9f8fe1d3a3fd1808dd921e3c397 SHA-256: bda985cb21fe6bfbc4199985bd2985e028ba7d1d08da2256a730c908bd5e8321
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised websites and potentially disposable hosting, suggesting an attempt to distribute further malicious content or engage in SEO manipulation. While no scripts were explicitly extracted, the nature of PDF link farms often involves embedded JavaScript to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://envida-nieuws.nl/bsb_website/upload_fck/file/fofugura.pdf In PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/nixudukadenewur.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607899ab17d65---63761158310.pdfIn PDF document text
    • http://wphs69.com/clients/1/13/13dd0a1135c99f886ff4006aa3c820ba/File/12119011408.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/7069ebaa27e2241491ef3a37e6e76b96/lufikexonariforo.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607610c9840aa---99632944841.pdfIn PDF document text
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/v0gcfpkktguv8keevhggcjjsq0/tisonokegobut.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e131bac013b---kaletesiporidekakivopij.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/4qh4he01piqo8t7qnpmfegmg91/52100046276.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/dedidug.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/cb037e5f82dee97620f607556a0f5cfb/zetewate.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/bulesivijijijo.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/8348ce8ae844f234da06ee816566dc21/dotujuxo.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/nogekelagi.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/pafaxakuleraki.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/eet300ishbc9pkceqmb3r6g5nq/19208876399.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/91624296092.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68923366319.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/5adb6ce2ffcc19d97ced1892a6158c42/4268051877.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607767496381e---7965002203.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2ab5d27de---2707659730.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/89247444464.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/mulopemikirebupovubuno.pdfIn PDF document text
    • http://mvhs1964.com/clients/2/20/2030ff4f331b14c2016b95997514b7ac/File/34821339091.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608d193440c18---notogobugew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=exposure+therapy+for+social+anxietyPDF 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_off00012304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12304 18304 bytes
SHA-256: 431feeb0db784e525bc842e69a270400d582c9cdcbe373024ac7a2337b990b11
font_01_sfnt_off000152c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016add.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16ADD 10876 bytes
SHA-256: 75f71c106859e4a6d70e40c4e22b899300b838f711c64e0587ed2a923a624d14