Malicious PDF — malware analysis report

Static analysis result for SHA-256 0545d59d572d52de…

MALICIOUS

PDF

94.6 KB Created: 2021-07-03 04:13:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 61164774b0a74e7127b4452be183babf SHA-1: 594e3420533b90c3e6c61200dfe1ffc0bcc9e743 SHA-256: 0545d59d572d52deb3756e10343512396ac61990f9a4f6d97529c40dc5a55f1e
156 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 WordPress sites hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to redirect users to exploit kits. The structure suggests a link farm designed to obscure the ultimate destination of the user's click.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0e9999312---51438729952.pdf In PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16091a5d1bb29e---30269950133.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c74a81242dc---89965465741.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/59588658823.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16097d1eb8857e---35522329614.pdfIn PDF document text
    • http://rld-carbon.ru/file/43836204240.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607636328a621---pamaton.pdfIn PDF document text
    • http://www.celso.org/download/jafak.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160872c2331b49---xisujakatamakilod.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a565b3573d9---89944407088.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/jizedi.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/minisokaxu.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16090a0c166e9c---26180146248.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/g8bm8qu4n0477884q80al64ru6/1488660731.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b95098126---mopaxabefoxenitaxezawefa.pdfIn PDF document text
    • http://chhsclassof64.com/clients/b/b2/b21d6454c74b38f294a67049e63db9d7/File/28724623782.pdfIn PDF document text
    • https://casentinoshopping.it/file/jiwobuxoxidujegivi.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094954fa57fa---sapikasorid.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/detekozerawan.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/wamuge.pdfIn PDF document text
    • http://ekotronic.eu/files/file/veloze.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/jijizimikukuzumuxujar.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/cd8f590d0eda55a2cb611213b530f4b5/56706658575.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c779db30b31---15805424037.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=low+inference+notesPDF 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_off00011122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11122 10164 bytes
SHA-256: c5c59236271242b615685441b26332b9e7a0c58caa030e442cc890d595adf69a
font_01_sfnt_off00012813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12813 17428 bytes
SHA-256: 6579f5f1a46f09f66564673fd6f0459f4fbec2f3ec3177e13f65946548e04897
font_02_sfnt_off00015541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15541 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1