Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f04374b2cea0790…

MALICIOUS

PDF

86.1 KB Created: 2021-07-03 00:19:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c9aa85ed4833ec438e50f96d3b102a18 SHA-1: 9363b7eb753a6c624a62984119ad6aae592b04b1 SHA-256: 3f04374b2cea0790b237c659f8afd960ec26e92d8ab80bce1f5afd51e91f6db5
196 Risk Score

Malware Insights

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

This PDF document is identified as a credential phishing lure, specifically targeting Facebook users. It employs a link farm strategy, directing users to compromised WordPress upload directories, likely to host the actual phishing page. The ML classifier and ClamAV detection strongly indicate malicious intent, with the primary goal being the exfiltration of user credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=star+codes+for+free+robux.
  • 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://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2f32b3ba9---zatikimirusopowole.pdf In PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/65188gspus77a8o769387otjnl/84541619798.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608933dd9b501---69914178762.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084483fa9225---jojisivumalanexodo.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/dutatevoduxur.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/xarunasakegigamupod.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d8406f775a3---birolewujowonimufowawo.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/18929759715.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/e46bb77c192c32c34e0dd3d0da61bcfc/muvumotaritapusufexo.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a250ad1fc52---divaxunu.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/96031931488.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160723092eebb7---durutavo.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/tfj0dq6q3j8avq9r8jk2dmhpn4/60408228962.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/8a6fa7a88917b1594f38be0299fd836d/4372815962.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/baf3b767f51658fedc664881e0566334/51619997910.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608693ef8870b---netejovasigepasil.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///47492933557.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/72539351531.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ade013bc1---93142950716.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/pojovapuwidexu.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607002553fba5---mijugo.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/xuzodumerevewujumut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=star+codes+for+free+robuxPDF 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_off0000ebf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF9 17672 bytes
SHA-256: d75dcf3042b3aa3978e72700ee3fe33ca74baf88c4bd30439ba83acbdd85f096
font_01_sfnt_off00011a4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4E 10644 bytes
SHA-256: d75648fe395e75087ccd4698f9232927932840658d955fdb0fb2fcb8f462fb86
font_02_sfnt_off000132d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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