Malicious PDF — malware analysis report

Static analysis result for SHA-256 923e12832e642955…

MALICIOUS

PDF

82.3 KB Created: 2021-09-07 10:12:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ab01790c97038fd988c387c597363ea6 SHA-1: d2e2875744d3edeafc9cafec52dd810756ae7b3c SHA-256: 923e12832e642955a2a6ce7f729ccb4cb1596984facf8bf22583015681adb8ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. Heuristics indicate it contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the PDF structure itself likely facilitates the redirection to 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 http://studiotecnicolamanna.com/userfiles/files/72198674019.pdf In PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fa2000e2dd7---86932261941.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/20216182119499134.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/paxavigotekenuraxudopiv.pdfIn PDF document text
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/lenavonuvumaxu.pdfIn PDF document text
    • http://mav-auto.ru/images/file/98045740364.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611700cd530fe---44069620293.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078381ec471b---zalaga.pdfIn PDF document text
    • http://webhenevents.com/clients/868374/File/dofuxadosurirekerol.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/puluvujesixejozupawera.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/8040881394.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b26f1bc5f53---gagerotise.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/orbtttq5ih2p2dua5stdqnlvd1/9266377106.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/20219395698422.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/38709985063.pdfIn PDF document text
    • https://digireg.org/upload/lolarumadefiwijub.pdfIn PDF document text
    • https://equipelec.fr/ckfinder/userfiles/files/60290713604.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/kulewibeburirebajur.pdfIn PDF document text
    • http://aimic.com/userfiles/file/89257545927.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/fovuxafeberapuxo.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/85219540040.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/gegunowakaxibukoj.pdfIn PDF document text
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/zudutepogozix.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a7869967c5f---jiromixirawusolewo.pdfIn PDF document text
    • https://bauarch.bg/files/40205114918.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=concepto+de+derecho+positivo+pdfPDF 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_off0000db28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33F 10608 bytes
SHA-256: c5ba143ef9d05c59d6d78b159f18bbc788bf7fcc7eadce049b15a605ec5c98a2
font_02_sfnt_off00010b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6F 18968 bytes
SHA-256: f6fbcc9a452dc8fa083712bc870615cef785fa51aa341f7435d24416bd1a4a14

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