Malicious PDF — malware analysis report

Static analysis result for SHA-256 45d418c41f27318b…

MALICIOUS

PDF

86.4 KB Created: 2021-10-24 10:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 594a2f3850c6528ad4a69c9d79a47f70 SHA-1: b9db4852c6c1e4885e41b40805a5026eeb682b00 SHA-256: 45d418c41f27318b35cdffdf6adbf21b1d09dd0be28184764c71fdfdc47f8de9
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms. The presence of numerous links and the nature of the detected threat suggest an intent to redirect users to malicious sites for phishing or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://cluboutletmoto.net/campannas/file/gavivunuwetumabafa.pdf In PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/lanukuxategujasa.pdfIn PDF document text
    • http://ranjoysarkar.in/FCKeditor/file/reximavoroxofuk.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/81314d1bf74c8af32772b1219a66411f/8416818011.pdfIn PDF document text
    • https://loonbedrijfschimmel.nl/userfiles/files/6428386387.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/zonubotabilarejanuz.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/81347738813.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/29567100493.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/f8b7cd0e4fa91e53c3def44b1364ac33/medorupabudan.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/37847945025.pdfIn PDF document text
    • http://artdental.hu/editor_up/61429510349.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/28047356256.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20211017141506.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/2d185ed387f160e59f2d06a9bd50311c/86014079488.pdfIn PDF document text
    • http://arsvet.ru/img/upload/bijixofusidedud.pdfIn PDF document text
    • http://carmakers.cz/userfiles/files/batamorakazixupimuri.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/jirisisenu.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/17309058223.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/43589171170.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616f07be12da3---60240309815.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161339134ee3c3---19207463719.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/16077006974.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616f4415853c6---matefojabetu.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/kunuluxaruboloxotu.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/xijikororilon.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/2I9n2o-U8HI/uplcv?utm_term=the+learner+communication+skills+book+pdfPDF 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_off0000eca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA8 17620 bytes
SHA-256: a46c1a259967a957b1284f99263b989faf65549172d5a9e1bb6e014a71aa6d88
font_01_sfnt_off000119e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E2 11180 bytes
SHA-256: 6929522aa432da96d3ed8a56eb649ab01ff51acca447451e17f84c28e38f9720
font_02_sfnt_off000133a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1