Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d5bec250ce22b57…

MALICIOUS

PDF

70.5 KB Created: 2021-09-16 06:18:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 77d6d7c563847bb504478003be0b2e79 SHA-1: 983873c74a1049aa6e6294d7ca8ef00d4f5e26c5 SHA-256: 2d5bec250ce22b571061cdcda6c843f3023189a70704ade78d8a3132bfb64cca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it functions as a link farm, pointing to multiple domains, some of which are associated with compromised CMS uploads or disposable hosting. The embedded URLs suggest an attempt to direct users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://boldogelet.hu/media/32940885082.pdf In PDF document text
    • https://mytekas.com/UserFiles/file/34344885695.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/pubufazejupuloxuje.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/ddbad771a6c94c79743cd4e176369699/35236284337.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/gaxisigobugowufapulofek.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/lodaz.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/sivagapavimin.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/levedogofanake.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///18265496573.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/8513674098.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/55217588101.pdfIn PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/xojetuledora.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/53852020882.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/lupelimuvonin.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/puzabarunaxen.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137190981f5b---40577081842.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/90661053390.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/54512643714.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613b49360ef06---91195335519.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/tamufoxejeg.pdfIn PDF document text
    • http://gibisch.info/files/files/futitex.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/31797502274.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/simepotaxewesaxofejadov.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/juxagozeraza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=war+plane+games+for+androidPDF 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_off0000b461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB461 10736 bytes
SHA-256: 2fb1d1e696442f7bf4cfbe666fb19c73709f9a96ec436678bd5bbe3d38c9a89c
font_01_sfnt_off0000ccc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC5 15604 bytes
SHA-256: dcc5efc43dd7bf0371238b9db51a4c8e7656e53dc52eca6f5301b18943007d13
font_02_sfnt_off0000f458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF458 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1