Malicious PDF — malware analysis report

Static analysis result for SHA-256 37bd596779cdff93…

MALICIOUS

PDF

123.1 KB Created: 2021-08-01 18:11:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 57e761c6f36d8100f69c1092078ae614 SHA-1: a76e441a94c1d5d6eb043d47cb1c911b0920893b SHA-256: 37bd596779cdff937bc0cd1f303ac90995257a74bcdd5fad2eecabb2674dafc6
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://inwebjor.ru/uplcv?utm_term=desenvolvimento+web+java+pdf PDF link annotation
    • https://niboparis.com/upload/fckeditor/file/1627108218_1.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/abg3g9bnc1d4g9l2em500d6251/ruzemud.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/v95e6t9sad043bmjetqp1ti1r6/tovawavisigeg.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/84855314762.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/664c3aaa6734c21eb68812be7f1c61aa/40590869577.pdfIn PDF document text
    • https://unitjaya.com/contents//files/tagiro.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/0q081hcep4jqja0l90iaeanlh3/9692087304.pdfIn PDF document text
    • https://chp-travel.ir/data/file/bumavedibejixopuje.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/bilotofajo.pdfIn PDF document text
    • http://capital96.com/userfiles/file/54906972254.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/g1tacic62c2uajec8g5r7oqje5/8936849277.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833a68b9b19---bokemoturolibikivaru.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/buxadu.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/57425336532.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210604_131532.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/fc77ed06761bb45c3864c31093b1c71f/kapakuvowelelulal.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776c1371d39---setegulodibelobokob.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ace1106947---nijezabagamuvezexunen.pdfIn PDF document text
    • http://bomtvplus.com/data/board/file/20210606181324.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/77038463640.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882b032323b---352835242.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/64042932848.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/vusipa.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/72813064134.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_off0001797a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1797A 10980 bytes
SHA-256: e3c11a16b83eabcc505aa0883dafb7d7060de02f3c9851809f1742d5a45e8b80
font_01_sfnt_off000192c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x192C8 19660 bytes
SHA-256: 3d2f7ff6f528fc74ed0e81e0d9bed26921bdb4dd0eced6534bee033df91b5305
font_02_sfnt_off0001c4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C4BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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