Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bcbb3024cb30ff1…

MALICIOUS

PDF

90.3 KB Created: 2021-07-02 23:13:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f5f2278ec7f650149af399c053a63a83 SHA-1: 7f91a40f5ad9ceebfe0f7f9cdd12e010032a23e3 SHA-256: 0bcbb3024cb30ff1045cad4f466a6793f6bbb6a70a3473e0f8e469ca369b5cd0
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

This PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous links to external PDFs hosted on various domains, suggesting a link farm designed to distribute malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs users to open a password-protected archive, a common tactic to bypass gateway security. Furthermore, the 'SE_MFA_LURE' heuristic suggests the document may attempt to harvest MFA codes or session tokens, aligning with credential phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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
  • 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
  • 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.
  • 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://easybuildapp.com/files/uploaded/files/89102010161.pdf In PDF document text
    • http://bielle-srl.com/userfiles/files/88349273040.pdfIn PDF document text
    • http://jfkanacon.org/data/userfiles/files/28883618648.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/fikipowowijuvunasemu.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/wimikopinukexeninenalitil.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/18007429924.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e55b30ea4---favokedesegawesopasap.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b1e59a740---20401313545.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/xovelunola.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/e6b1467beb6ebdbfcefd083af23a885d/sunagi.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/2a1c13c8544318c2f69c9998d92be2ac/77647548782.pdfIn PDF document text
    • https://nhakhoaanphuoc.vn/uploads/files/63530870561.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/6cbe57692aaedef3f92be7d8ece9a11b/54761731460.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/68886947064.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/3b6596dd9265167abf5230f3c5a58670/82173595092.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/66bd4d3276e1704d7398cb84359c22de/xunopewa.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881c5c3c655---31204839537.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160786b5a7e878---19933783591.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/a0fbb2e13b6cee50bf7d9e8421fd07fc/pegesewom.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/dukuwubilor.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608847fe2817a---wavuxasiki.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf15ffb1f70---43371020834.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/9cd28e67021c4a3b69df4e0e549e590d/19077924792.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/nuteluxadowi.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae509a1486a---kofolekukidatulexutusafax.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a659a6b3959---kexirosunisisuvogiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+remove+password+from+password+protected+pdf+filePDF 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_off0000fbd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000113e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E4 17700 bytes
SHA-256: 83c70e2b7a1d6ea42a0a79fe38f4b21cdad1842cfec104621eb19171ff6f7412
font_02_sfnt_off0001422d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1422D 10820 bytes
SHA-256: 8c147e0160e2849c820fade33fb42b2f6cd4b14ae8f4077f2f252e79659192bd

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