Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4cca3a4c31d41c8…

MALICIOUS

PDF

93.3 KB Created: 2021-07-20 06:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 677dc7b872125dcd735319cd8b7e8895 SHA-1: 5db3fa4a69e285dfc862715dd850ba5eb881811c SHA-256: e4cca3a4c31d41c8bc839437d175aebdcf63eb8b19fd86fb533053c30fcb872d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely serve as a distribution point for phishing or malware, leveraging the PDF as an initial lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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 https://eastmanllc.net/ckfinder/userfiles/files/33438063198.pdf In PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/ca9939ae305c98df1e5eb055187a070e/5170854481.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/2417ef1fd43116391dd9d64a55d0fbf2/nuvikofew.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/45c54a56d0aa52331d4f37e390426e92/43058984108.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/vuvek.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160822bcd1eaaf---19055358268.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/beebd17051252bdc31e8d420e5efe476/zenunejaxenabonoj.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d4fd38a8e---11123786292.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/18920392695.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/1f6lq5b7s9rbt17v8tnraubq4s/petamakukas.pdfIn PDF document text
    • http://fotobambagiotti.it/userfiles/files/bufaxilabuzasi.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/77719822005.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/1d0442ad215bda9c53f7767fd583283e/liribexigopadexevig.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/vkme4eedbmi4lasvtvfr6bihbb/fimekador.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c4760f98b07---vavufo.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/roninebozanomo.pdfIn PDF document text
    • http://unityproductions.com/upload/files/74464724362.pdfIn PDF document text
    • https://dintek.eu/uploads/file/rodarimilikavamejopegib.pdfIn PDF document text
    • http://www.monts.sk/upload_images/file/kawawugapoguxoladewitama.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160712b3212963---93602361312.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/xowibavitenowepibulapiw.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f51ae86c9---nekinipemeregeribowagamo.pdfIn PDF document text
    • http://rideco.hu/upload/file/4736960718.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=geometry+examples+with+answersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF092 17784 bytes
SHA-256: 7c6493b48088c5ab8af7c35e2f1b443a27be5b1e30e109971af3ea44f139539a
font_01_sfnt_off00011f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137A5 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
font_03_sfnt_off00014cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CDB 10860 bytes
SHA-256: 573dc3dd078c427bb89001c23bcf8da704abbf066d12e7748381b85245d9dcdd

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