Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e5c2e3ea1dff1ae…

MALICIOUS

PDF

80.9 KB Created: 2021-09-05 19:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 853aac71988dc762d1d95ec7f5775218 SHA-1: 44917762f7c9a7360f02dd5c0e2c50d733849097 SHA-256: 9e5c2e3ea1dff1ae531de05d3113a0f8bf8e73d4d2f3408f015148883f65ea7c
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting, indicating an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and embedded URLs are indicative of a malicious PDF.

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://kaimano.it/file/63370341890.pdf In PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/161061899df046---webepugawipetolu.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/cee487415d9e9923b83557c1675b6c46/79256543001.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/52780551245.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/kunapelinujixarudaw.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/26884217823.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/piriligavuga.pdfIn PDF document text
    • http://vtaky.sk/media/file/38948907098.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/98683579223.pdfIn PDF document text
    • http://htbestcomputer.com/media/ftp/file/853123728.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161025a2c8e8f0---61900946803.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/waxezizatilis.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb71494d16b---41869087223.pdfIn PDF document text
    • http://prosquash.by/data/44244960405.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/ce3e2182ca8d2e964df35b7a4659578a/zilogabatuf.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/98156910792.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/1c07eb73848ca529be91d7eb3e33f9a0/tutipajutujapepiko.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1610e3d6e58413---jaxonipukoxabulux.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/tatuxujuxirajelitodirux.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/woradasip.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/39837179076.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/jivuru.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/6639956664.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/fopuf98n07rjebiri32urcomca/93103522782.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=graco+trueshield+infant+car+seat+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_off0000d96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96D 16644 bytes
SHA-256: 6be6ca457fcdd05b232fdabc6617be341f1cb684285438a945c8c4970da50a42
font_01_sfnt_off000104ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC2 10880 bytes
SHA-256: 5486819d8d3580c2c6fe1ae4c1122dd35863b344b4a061ae389f328f0e078886

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