Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf5ac7fd1cb6773e…

MALICIOUS

PDF

85.0 KB Created: 2021-06-28 22:32:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 02cf328f4fe5841e9eed2c40dd75285a SHA-1: 79e06d314e9b13b241736e2110d53c078d2c414f SHA-256: bf5ac7fd1cb6773ea374ee288a8671ca9e4c9beb63163847a6b3cbf1e12da038
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised websites and disposable hosting, designed to redirect users to potentially malicious content. The presence of embedded URLs and the nature of the link farm suggest an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://atut-biuro.com/uploaded/file/57493496385.pdf In PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/50939084477.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/762ffa052402c28013fafcb30fece44f/16513233978.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/monevozizojeferibasarak.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085bfba83424---44887903691.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/euj68tfmto6gp5e4t0ljoltj5b/pojudoxikixupetebax.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/tiposijawegifuvamagikat.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/f4d7cd93edb2298fd2b3ac4b3cef1bd1/16058750005.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606eed743d048---waforuposotara.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021061021582112.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/wimatibadavewijizilosake.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/vozimitepi.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/atjlugr9l8s77pjlgo2caempc2/dizevezujozosozosiwukuwab.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/26423811695.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/28117c38decf21aa8e7344f265b53ce3/95890028108.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/ximemasirizesulajulefuxu.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce1cca20aa---gefor.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/15ae565749567ef056a6c596658bae4a/jazuxigeg.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16b6ea46d6---pizurogosofimepevuzizi.pdfIn PDF document text
    • http://nctpa.biz/clients/5/51/51e593b678cc4707ea5ff7b662bcbdb9/File/davuvetaletevasavewegobup.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/17c4034aff58a3eb14b54eb3f5a68039/65923322179.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///mizidemuvunepokazexared.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609837a81f0bc---gixedimisivagip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=what+day+does+cash+app+direct+deposit+hitPDF 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_off0000ea3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10255 10568 bytes
SHA-256: 4f398c20a83069392fc3690599a3df76f5868233e686b68da9a14cfbb659c3c8
font_02_sfnt_off00011aa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA4 16944 bytes
SHA-256: 03834d03e0a8b37931c6884a6ee2e9b8f652bd7fb2e0bfd78f720c48bad83283

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