Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef38cd6716a12efc…

MALICIOUS

PDF

71.1 KB Created: 2021-09-06 03:15:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8407be609ea8c9c7d2b259958f31410a SHA-1: bbe4ed78fef006a771e8c11010dfab9995396690 SHA-256: ef38cd6716a12efc5df04ff2f7ac79a1030ee999b971a44bd85108ecab790c4d
156 Risk Score

Malware Insights

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

This PDF sample was flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the link farms indicate an attempt to exploit users through redirection, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://le-lemniscus-incandescent.fr/ckeditor/upload/files/jubodolivitizofid.pdf In PDF document text
    • https://amrapalispot.com/userfiles/file/semozafetu.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202105140958107409.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f59126d227a---lisawojiwiwetezab.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b76dc4ed4c3---lidodositinazub.pdfIn PDF document text
    • https://carlojans.com/cms/file/52599305246.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/70297038880.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/hia3gtpc59o59rrsd1j82ovul1/16247186837.pdfIn PDF document text
    • http://xinge168.com/uploads/files/20210807195319_909472.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/75837177179.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c8953b501---64270692471.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16071c672029c9---81379583981.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cb776571828---53107163973.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/sutepulazowiw.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/17833986629.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/efbdb78791ac77b1b7919a6be4a9ec9f/salokamikesuwivare.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210828095529.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087949205110---93058674837.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/c2ec589da74d8e9a6c280dcf09f8f2d4/42042769280.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/33955733032.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/26432983518.pdfIn PDF document text
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/30584434182.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/gegagerekibu.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/55f2217a25350af108138171b819f0d6/54754726091.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=suunto+d6i+instruction+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_off0000b539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB539 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4B 16300 bytes
SHA-256: eae0fd854a9e95891630163e7e0a2c9f1ed20591366bac330856bbf3e62237a2
font_02_sfnt_off0000f720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF720 10744 bytes
SHA-256: 7c66bfa500f46313882dddf0bb3d1fa0491e45cf6a46843fa03a1976ed129163

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