Malicious PDF — malware analysis report

Static analysis result for SHA-256 95f94f65b966fe1a…

MALICIOUS

PDF

88.4 KB Created: 2021-07-26 07:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 30449618ba68108fdeee4caf0de95f82 SHA-1: c690720fef23461d791236a6b4327b3ba697aef8 SHA-256: 95f94f65b966fe1aa8e2e7b85301648509ccaf99dbb5f3b9da8e1f1c61202c68
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. Heuristics reveal it functions as a link farm, with many embedded URLs pointing to compromised CMS uploads or disposable hosting. These links likely lead to phishing pages or further malware delivery, consistent with a spearphishing attachment attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://ranjitabiswas.com/userfiles/files/jiseravinakupidomivu.pdf In PDF document text
    • http://brenna-ski.pl/userfiles/file/rurerewimarufolekijuv.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/pizojufiluwowabax.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f44e8c876fa---37210124377.pdfIn PDF document text
    • http://abpaluso.com/upload/file/83328064534.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/lusaviratetud.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/9da6ae5b966ce3de136d69d4ef2b593a/54585382829.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e3886291b---sumejow.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/pesanaresoworunomedimil.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/87958858755.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/vevulagivabulunepos.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/65998605373.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/67560422624.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/73296671914.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/89100280921.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/ribifeleve.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1a4f9ecb3---xiwumeko.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf3ccc4d33---zivuvenovorisa.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/fiwovizanule.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f209bf9c9a4---xazizobaliwa.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/504253f56a4f910224cb310e42d9ded4/95457183869.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaabb976b8c---48427779041.pdfIn PDF document text
    • http://salinahighschool1967.com/clients/c/c9/c9c88be04994199279bceb128c91314f/File/jofewufigovidimatazotoj.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/33083539471.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=what+is+the+best+diet+for+hiatal+herniaPDF 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_off0000f540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF540 17380 bytes
SHA-256: 5e3584f8090d4b62cd0963fe9d332d5c67c954d34dd375f0bb8246530fc68a65
font_01_sfnt_off00012238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12238 10584 bytes
SHA-256: 0365b040a7c3d6435156694a3429cf8ce15f44b399b5c616a159a6cf0d2dc2e2
font_02_sfnt_off00013a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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