Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ee6c2f63a0f47ee…

MALICIOUS

PDF

77.6 KB Created: 2021-08-29 07:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5c1a89ed0d59871d944619bc9a0b18c0 SHA-1: ecc2b752894f19405c859f5263e166394dcd0110 SHA-256: 9ee6c2f63a0f47ee30d6fb23bbc265b27a9ecbba2bca4860456b7e10ae834b89
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The PDF structure and embedded links are consistent with a phishing lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/99e292a732fc3b3b3e8f00954d8bc723/basijas.pdf In PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/3ohqblpqqct5r9k9ramsehlk87/wenakikokenu.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/66347192058.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/pasugopu.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/39413752647.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/refuwulobitubijovidudijuv.pdfIn PDF document text
    • https://ovalpolycoats.com/media/8098232646.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/ikld4rv26as9p2kl9e4qvuoo48/3453744073.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e18550b9f68---15021552549.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/16841150369.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/39051495327.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607005a10d0b5---68351112615.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/146a8865488ccdf5df84136b88facfa8/68209772538.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/e61flsa1mt9a8pjm7dao0q9tp2/57733721346.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/nedonajaxi.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607177c12816f---nosarowupokofezibewaf.pdfIn PDF document text
    • http://ucity69.com/clients/861769/File/29155997058.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/xixivekawovujafigusu.pdfIn PDF document text
    • http://esistore.be/userfiles/file/rofubumupetozet.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/nawukelaminejanefetowawow.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62252765121.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=different+types+of+teaching+philosophyPDF 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_off0000d074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD074 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88B 10876 bytes
SHA-256: f14d939fe5b95688765dead7b33b08755a32147f25ebcaf302ca0601389cdfca
font_02_sfnt_off000101a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A8 15156 bytes
SHA-256: cd5ac6ff482ed7db88b9df7a937066fdcbb99f39aef8ff8bb7ba61c9eb198aff

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