Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f1e1208cad3d9da…

MALICIOUS

PDF

85.0 KB Created: 2021-07-27 15:43:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cb03d283da0d00e0c0ae775efc59b772 SHA-1: 4b3a1715a9d074d2ccf94a97a2585462ddb940c4 SHA-256: 9f1e1208cad3d9da73e5dbe284135771cf04c446fd97a518687b8d931c57cc97
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links to compromised WordPress upload storage and disposable hosting, suggesting it is part of a link farm designed to distribute malware. The presence of a visual download button lure further supports the phishing and malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9eede5369---42039929425.pdf In PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/a96a8ed4c043304be9033f0e4aac0dfb/zizezapowiwojokoro.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/burelurujize.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/162690067063454416865.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/921t08urtqfqng1ii6536i5a3u/kelarebupuxoku.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/f53abcc3a23719b0800156490ba5e9ab/kixupesorepi.pdfIn PDF document text
    • http://envigest.cz/upload/file/nezizopokenaxitaviwir.pdfIn PDF document text
    • https://icfas.net/icfas_new/dev/ckfinder/userfiles/files/vutesaji.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/55830439620.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16073fe9e5dc70---67593181948.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c97d280a683---93989544035.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///94461425936.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7fc9d32cf---95264663094.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/jotozamoxemobag.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878d440e584---vozerisimadadi.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/13063730494.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/pjdgkdip2lgphp40cvk5i00ge6/53073638593.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/xejujuge.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724b243c411---wesaxefive.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/66510735648.pdfIn PDF document text
    • http://ongnuocdenhat.com/upload/files/saferi.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c25120af03e---lobadom.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/p879q3jomn9174emglu3kdach6/20800082144.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607815699dc44---semano.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf92b3b82d4---gisafimelu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=customer+visit+report+template+free+downloadPDF 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_off0000ea04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA04 16592 bytes
SHA-256: ea2c1da1073eede0ce86837a642b683b4089e42c9459a948a8e68876c9846339
font_01_sfnt_off000114f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F9 10940 bytes
SHA-256: 6d747e8fc8c882f8294815c1e23c0320cbd7b29341689ad204f4de8309a6a4f4
font_02_sfnt_off00012e6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1