Malicious PDF — malware analysis report

Static analysis result for SHA-256 95957e4b78e69fbb…

MALICIOUS

PDF

86.5 KB Created: 2021-07-24 00:32:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 272d143e5dc7d2842c24bcaf3b2916db SHA-1: 623902db216f22e597c2e8f7157db9a45e9132c1 SHA-256: 95957e4b78e69fbb97b3107b15f620dcd1da8ee5938b6226f1831d1eb4e30d26
264 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and multiple external URIs, some pointing to compromised WordPress sites. The document explicitly instructs the user to disable security software and provides a password for an archive, indicating a phishing or trojan delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 10

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baeff71f739---danalapasij.pdf In PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609a266863534---1106920737.pdfIn PDF document text
    • http://anthonyellisonfamilyreunion.com/clients/f/ff/ff850d76676c1858bf5e443b7a907d3b/File/xaburotunirifitobajirewu.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210624080621.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a25bf1bc54b---jinobesiw.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d936bc81d---lonowemigepumew.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/8902247848.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a4017bbb7---sutegemadonukur.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/dupoma.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pewaxod.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b553f29d49---bafanolefoxobizizukomobip.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/vivojufewurulozofop.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/64baa5dfbc41a530ae945127c8b6f9d8/pujozuzuwinumupageji.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160975399997bc---dewizebajo.pdfIn PDF document text
    • http://127.0.0.1/bantraicay/js/ckfinder/userfiles/files/pemizijaripeg.pdfPDF link annotation
    • http://kondicionery-ivanteevka.ru/upload_picture/file/vovisisepupuxade.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/89755572451.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/lilajez.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/87637221274.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/47452535147.pdfIn PDF document text
    • http://rghsalumni.com/clients/82979/File/ratofakibon.pdfIn PDF document text
    • http://dentherapia.hu/files/file/5958367211.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/12550954413.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/186904892360d74ed27e589.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=epson+adjustment+program+free+download+l3150PDF 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_off0000e8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D7 11528 bytes
SHA-256: 8eb1c1e8bda40899a983222a6ab02725ccd8ea8c87b4fec2e5c24cb98fed66c4
font_02_sfnt_off00011c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1E 17516 bytes
SHA-256: b9dc71a64c3c680201c00e2778df9a9ec29756a6684eb67d352a5613a46c01fc

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