Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c1cbd8314773fbd…

MALICIOUS

PDF

456.3 KB Created: 2021-07-02 11:36:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 66326f58d550f0b7948c88e47f43fc03 SHA-1: 4fce310ef3f46eaa62a2afc7140e5024fe7a7f1b SHA-256: 5c1cbd8314773fbdade0b21bd608104261efc992875df9f4b955786eef95e92b
242 Risk Score

Malware Insights

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

The PDF contains multiple lures indicating malicious intent, including requests for recovery secrets and password-protected archive instructions. Several embedded URLs point to potentially compromised WordPress sites or other suspicious domains, suggesting the document is designed to trick users into downloading further malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7601

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://asokmontridental.com/userfiles/file/vovulajipezagave.pdf In PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609044c988ebf---saxonirubovina.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/varukawetupub.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/70639267064.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/2piq2hpq4s6egm46g7cai0kpli/8613047819.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071e3c5e4abf---93046704986.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/00377fae11f0895947c87215c3e88152/xesebipigonidoz.pdfIn PDF document text
    • http://candientuvibra.com/images/file/72285741492.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210510035614.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/6bdad5b9754dbbefef5aaf4cb99d9213/lewiveniloledemato.pdfIn PDF document text
    • http://allycatering.com/userfiles/wopesaxewuvufirom.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/f45adac71eb1451e230e32524c4d9b6b/tukijopumozawasivukuda.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b64ae9f3d07---25927689144.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/be33bbf3fb1f73f6d20a6e1fb14216fc/fuwefemasevewaj.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be7a416dc1f---wawid.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/82odkbu6edff57jhj3ljflq5r6/18947616379.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/bokotugev.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/icb46gpa6u16hifconglrvj9e8/81664278669.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/10172026097.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8d42ee5a3c384ed791d5409a843c5d89/puvobal.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/k7mlkttjd5upaialh2oms5bgu1/48895110763.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/2poamtkogfe4refvbe1r1ao115/59630913484.pdfIn PDF document text
    • http://dichvuwebsites.com/media/ftp/file/7357375021.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/92009150920.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/1806eaa42ba321d5c8fc0bcd8e40efee/fafixi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=concepts+of+programming+languages+10th+edition+solution+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_off0006ab99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AB99 11372 bytes
SHA-256: 22a66349d12bbe508717518b3afe32bf1c97ebb033769c28a277217dcd75694b
font_01_sfnt_off0006c605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C605 19080 bytes
SHA-256: d1bd1368f4b5354d413f30b73a2dac386c7c34469b99d4c8e1683235bbe7046d
font_02_sfnt_off0006f8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F8C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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