Malicious PDF — malware analysis report

Static analysis result for SHA-256 e16c27003e8c1e75…

MALICIOUS

PDF

69.1 KB Created: 2021-09-26 19:26:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 511be740f785a2407c3531d87f1a6651 SHA-1: 9b37e1217c59540ca1d9760b1ca2a18f950f4242 SHA-256: e16c27003e8c1e7533448e01fd1fe531bbf24acccf2524416b22e84d9bd35f02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to lure users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=rise+up+apk+mod PDF link annotation
    • http://baugeraeteverleih.de/benutzerdateien/netiguzadudetugolesasamox.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/kulumigikilige.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/wojizexoxubupote.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/jobepebavigifapasirofik.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365e4a0ee89---jasex.pdfIn PDF document text
    • https://termofriz.rs/files/68713585786.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/23877025274.pdfIn PDF document text
    • http://jawarakreasi.com/file/11934565664.pdfIn PDF document text
    • http://opersan.com/file/nitawirubafi.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/51062260965.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/901114946.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/25609494760.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614382e3d503e---lasenupij.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/senibiso.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/50740074906.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/25712921946.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/lowogabubiranurem.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/55671324853.pdfIn PDF document text
    • http://hak-al.com/resimler/files/fepevinoja.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea690c7bd9---19910829877.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/d45ec84305e99cbf572abdff61a3b08b/muxerukedijuware.pdfIn PDF document text
    • https://davaocarrental.com/images/file/vesokajolokevo.pdfIn PDF document text
    • http://perfecturology.cafe24.com/upload/editor/imagefile/2699595266.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_off0000ae49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE49 10440 bytes
SHA-256: 95fa7dcadfcb39e10a1adc4cbfae18fef90d6f72fd2dae88e7ee72206c71f9a4
font_01_sfnt_off0000c5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F8 16168 bytes
SHA-256: cc40e1f47361eec5762c45f3e02ce49bae435eda041df42ac9b2494504a13838
font_02_sfnt_off0000ef5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1