Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c7c86847b672592…

MALICIOUS

PDF

77.4 KB Created: 2021-09-01 01:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 471be9fa8ec25e19d14376cf2c0e5025 SHA-1: 2595f0893be3b848f23b820847faa594d12c540f SHA-256: 7c7c86847b672592238d26889016fa7baf1a99ac8ff448440a92218b48b3b990
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to direct users to malicious content. The document body is heavily obfuscated and unreadable, indicating it's not intended for user consumption but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://catamma.ru/uplcv?utm_term=chapter+1+research+format PDF link annotation
    • https://bravo-hk.com/userfiles/file/rotojokatugas.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/53ce81d3245df5c4750e93b184fa59f0/51058381783.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/79542320094.pdfIn PDF document text
    • http://tieclangman.com/Images_upload/files/69862384850.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/813934797.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/22082394175.pdfIn PDF document text
    • http://geobrofab.com/clients/d/da/da7cd3953015cd63472398095fc1fcdd/File/28345983867.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608021326fd82---bowixinuw.pdfIn PDF document text
    • http://agama-rc.com/upload/files/gofiwekuxunajafedexeso.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b64c2637926---56440440302.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/9179e2a558d049770eae577c52b30fe0/22087045158.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8e20eebbe---konevosu.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082faceb3a29---71508037280.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/74342624416.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/3f6oo9efq1r1tirg6krmcp2mn2/78426963173.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/10530660436.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bff2f305524---5870175411.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a8df24762---99209523962.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/3f28osfjfndjnpqselvsns7ii9/83271262739.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/4l4rhu23qlacg2e0hreo99n7jt/debunozovadefakoj.pdfIn PDF document text
    • https://emmaushuis.org/pages/kivog.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/p11cmirv94gbfdt57db629ir53/15228493364.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/57146198808.pdfIn PDF document text
    • 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_off0000cb65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE377 17080 bytes
SHA-256: f568dd1c8ea68d60f926ce0e32c707101a3e4075690ee0754664ed4292242a3e
font_02_sfnt_off00010ece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECE 10584 bytes
SHA-256: f63a991ac686fd83e9f7fbbaef49196890e681d180b5aef5f62df065d374ea1e

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