Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcbfe1344260c1d2…

MALICIOUS

PDF

82.3 KB Created: 2021-09-16 03:31:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: fbc6651df2fdbfc815285d52cbf50c1e SHA-1: 16ecbad8691e39cd83170ce0c99e5d6177dd1601 SHA-256: fcbfe1344260c1d2a1b9f6c6c0f8655a8694eb36297de0ea6a96d7d35852152e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. The primary attack vector is likely Spearphishing Attachment, leading users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://drafthe.ru/uplcv?utm_term=sector+formula+radians PDF link annotation
    • http://meetburgerusa.com/uploads/files/12480046383.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/39636692488.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/49471461239.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/jogopisowovuvikasu.pdfIn PDF document text
    • https://susta.vn/userfiles/file/21191684467.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16141db0d533bc---rizilivasej.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/bewafetevapef.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/78384351656.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/golasufoperigaxufipiwu.pdfIn PDF document text
    • http://methese.com/upload/files/vukajapemezikisizajejuw.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/66833757077.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/b065836764ffccf632069aa74df407b8/84357478321.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/161355f42e49f4---99398132651.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/mudadifolowegijerawex.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/katiporit.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/maluzesujekofakugekuraku.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/34445841229.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/vixuperuzuwuwapelum.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/73228497306.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/pexelupixiziropixuv.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16141d08978642---87923349656.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c69dd5799---kenemifeviwipoxunirito.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/senixatodeju.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/25571023007.pdfIn PDF document text
    • 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_off0000d832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD832 19020 bytes
SHA-256: 202d19d376dcfec265e83645ed36781907a18ffc770c22fe5bd1dd9ea7bace23
font_01_sfnt_off00010ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D7 10812 bytes
SHA-256: 9444140ecee034e450ed8c8e170a75cf3304a49be2fb0b0ba75103beaac26098

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