Malicious PDF — malware analysis report

Static analysis result for SHA-256 52b34b46ed2279e0…

MALICIOUS

PDF

93.8 KB Created: 2021-09-05 01:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ca38302049c645cf9eb5d7cf59f8e5f1 SHA-1: 3d124b724343a3386fa1b19bf5ea983ac9a9e1fd SHA-256: 52b34b46ed2279e057168dacea95bdd323fec787e0cb254406c9967af91245db
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are flagged as part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://debandhelder.nl/ckfinder/userfiles/files/85089619857.pdf In PDF document text
    • http://ecilingirler.com/resimler/files/88109368064.pdfIn PDF document text
    • http://sanaspinler.net/calisma2/files/uploads/42654279964.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/6233503606.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/48557744104.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/43201371695.pdfIn PDF document text
    • https://mytopics.it/uploads/file/99627285807.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a9eee6cc381---zenipifa.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/bezixu.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161294cf467bab---fumesibunodidirad.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/foluxuramebikesifuvivun.pdfIn PDF document text
    • http://gilbertthomasreunion.com/clients/5/5f/5f56fe696be94dde62972871c8a9bc28/File/gamikobe.pdfIn PDF document text
    • http://koala-al.com/d/files/46874431180.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/429416c6078c192699c87540ed5d52a5/65842133557.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/17280044520.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095773a41b62---malevasikodonelonapot.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/dutezonofitif.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/59952452213.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee1575a5a77---lakakajajokozoxisem.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/rujijevufubosojidofi.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/33300adcf23f14704029eafc4470c7bc/20890378378.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608e721e25d56---38595871570.pdfIn PDF document text
    • http://goref.ru/files/file/muniram.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/67972810947.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/bojodiwod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=lg+inverter+air+conditioner+user+manualPDF 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_off000105bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BB 19232 bytes
SHA-256: c22db8640e664076c3306360b7d4a2c387b194b88a1e3f9e4758a3c9afb4a7d4
font_01_sfnt_off00013814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13814 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001502b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1502B 10836 bytes
SHA-256: 0b1048bf4024133aa4e5cc25538282f69338e6514be480648aada75b93467fd2