Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5882941e18fbed2…

MALICIOUS

PDF

77.3 KB Created: 2021-06-27 08:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 198e6e7fcf6ba728033ebcbdb115194e SHA-1: 92bff8860ad7aa35b54883f1d377e21f8bc2a3ad SHA-256: b5882941e18fbed247bc10ffb9b00a2e6b2e014d8d38c5f3cd54d116658469f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised CMS upload storage, indicating an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it is designed to lead users to download further malicious content, likely through a phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://sjar-tech.com/uploadfile/file///2021052001335091.pdf In PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ada32069c---vebavazatenakutu.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed393e1bd0---kiwulejorege.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/85274777934.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/xaxilo.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ab169311c1b---62098624000.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16099b93d6a948---kilirowaleruxigisusenig.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/29fb0e291d4526f7b133862df85a47e7/77620875587.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085258ad036b---sivulifegavisozefijipa.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/bafofamut.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/95406587663.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/k8fafkuhu48tvqp9tc654eain0/vanemeziduzufewad.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/91519109563.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/fd21d0a87bf09ec7575df4279f72d371/vifovaxubigikudizerama.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/68967764774.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/fipoj.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/63562168518.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7cb7ac4be---5266025492.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/4eb7b00419a6c84ab9cfd7a628082a0e/xepalixezesilixozej.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/0jv1ekhk77ie7kled52gndea20/sogovafakajimiladibolakek.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/dafomepozagujoze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=information+security+books+pdf+free+downloadPDF 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_off0000c9f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F2 16712 bytes
SHA-256: af922bd0840db031fb960d6c4c58a0b63bd538298939de1eb5af3deceb541649
font_01_sfnt_off0000f594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF594 11264 bytes
SHA-256: b4419f0de949070a37d614d3cb779903e0a1713caecb765f83056aaab0a9fab6
font_02_sfnt_off00010fe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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