Malicious PDF — malware analysis report

Static analysis result for SHA-256 4372b35e1acd464d…

MALICIOUS

PDF

73.1 KB Created: 2021-09-17 02:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7b03109a9a65c0ad2eba41969aad5a44 SHA-1: 8814187d31540b18802dcd59acdcc63a236f02b8 SHA-256: 4372b35e1acd464d07104e91c6c7d2b2399e4b3f59813684254b5996fd7be4ff
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. Additionally, it functions as a link farm, with many URLs pointing to disposable hosting or compromised CMS uploads, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://clubberia.com/js/ckfinder/userfiles/files/livip.pdf In PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/7f4611b23be02ae1554e650687572322/newaguduledoxegum.pdfIn PDF document text
    • http://swhos.com/upload/files/13539210913.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/31093253856.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog/file/narikaruzuku.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210913_D7F26755D2B5E97A.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/81985769509.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/dd2300a5177367cffdb3851ad0011e43/812840106.pdfIn PDF document text
    • http://nktrading.qa/file/files/viletosop.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210910163130852457.pdfIn PDF document text
    • http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/retexewumuza.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/lowunutupibapefi.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/1696870450.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/46764571849.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/35689119767.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613638cd307c5---77154627191.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/sajozexof.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/42953516288.pdfIn PDF document text
    • https://telenovella-bg.com/files/defejidaruras.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/wigozasurokal.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/visetajatuxuliwi.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/9871d8ea63ac81dcdcefc869c961001c/31778435709.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=drag+race+all+stars+season+2+onlinePDF link annotation
    • https://b2cdemo.tickets.com/content/files/voworuwifiradoginenikug.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_off0000ba04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA04 10524 bytes
SHA-256: 7cc3e0a6aad9d89212b607f2e4f0a4f7fa26c6d709eb72396b1e2e9d593e84de
font_01_sfnt_off0000d226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD226 17284 bytes
SHA-256: c1d471d1bc46895cedb6195756f8accb32a46435e6e90af4848da3d2b7862be8
font_02_sfnt_off0000ff0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1