Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5d5e994d71a3514…

MALICIOUS

PDF

93.5 KB Created: 2021-08-30 05:38:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7a3d04cd9ffc598c8069ae1f7a2f232e SHA-1: a13f842ee29c38040e4b8eeda5557d1455fdb416 SHA-256: d5d5e994d71a3514521dd4591f820b23b62e20f5c1c03acd499a03ac93de0a07
204 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or credential harvesting attempt. The document contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. The 'SE_MFA_LURE' heuristic suggests the document is designed to trick users into providing one-time codes or MFA approvals, likely to steal session tokens.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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 http://thamdinhgiadaiquang.com/img/files/loxem.pdf In PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f67984668c7---febinu.pdfIn PDF document text
    • http://jinxinghotel.com/uploads/files/modijisapixorepegawepasi.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/9834d12598cb221a52ad3b2d41c2d470/90165370545.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/554da0a22d9994b552a803afb701d839/ralorixazotajoledoke.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16073b66ce9597---37890771945.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070017c70915---vamurawofoloxalur.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/95550663327.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/71065662168.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/411ae394db03ac9996ac2aceee7f3ac2/vexabejegewakatim.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/064b2a3dc8945aeb3a8991de5bced601/48350616438.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/6462392251.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/52183152338.pdfIn PDF document text
    • http://teenaramainc.org/clients/875997/File/ledizuvoriwaputo.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d256f148e7a---88381069894.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/05cb5c153fedd09ba41903d052a128e8/8925415289.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/c5808d8bd00ad56c22ea5402986d3950/fukafinipepevasomedov.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/899b3fa6ce7a3b31f530dd094409f2ef/72466386543.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/navafuxuf.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/mofeges.pdfIn PDF document text
    • http://jucal.es/images/file/64757194135.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/feadfbe35ef897d5b33d21258b0976e6/reviwusuzugumatodekez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=plane+and+section+in+anatomyPDF 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_off00010b54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B54 17876 bytes
SHA-256: b0ef81810c2ffdf7938ec14c78945fd7bfdc783e171a14bdf12de40f2e253e12
font_01_sfnt_off00013835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13835 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001504c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1504C 10544 bytes
SHA-256: 34827a8de08baba9127a8ced103e673968f0a80d6d891fc0252e39fea6b1eb57

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