Malicious PDF — malware analysis report

Static analysis result for SHA-256 0eb577ebd7173b72…

MALICIOUS

PDF

91.3 KB Created: 2021-09-08 09:33:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 47f0334bb6f8fa905e277f25eee58e94 SHA-1: ccef8365274ba54ae19c27b176074f1938135f45 SHA-256: 0eb577ebd7173b72d2ae89647414443052bed81a5eebdfaa070f3792764359a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that likely lead to phishing sites or malware downloads. The presence of external URIs and links pointing to compromised CMS upload storage suggests an attempt to distribute malicious content or harvest credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=organisational+learning+a+critical+review+pdf PDF link annotation
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/eb018315fbfdddb7426dcc80fb6ddee4/17119689884.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/pagapekapejozomoru.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/xogezinekarekegus.pdfIn PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/wuxofinaxetuwubuvakut.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/53622229926.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/zulorupoke.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f161366b14---33915873124.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/paxowofu.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9054d8396---mevanixiz.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/jagesur.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/13dvmlimrea9n6jitgs6vccf82/serovuliwebilagofe.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/cukbligc15u5c1758c5eu1gs12/xomerezelu.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/706300645.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131ab0445534---70627682619.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/79090101623.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/subosidadu.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/posetibemepisinomazesa.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/0ef4cfb319b6811dd998500ab719577c/97692504647.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16073a106d7312---fenetawizagul.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/xupetisinulukemow.pdfIn PDF document text
    • http://synowka.pl/galeria/file/55937324425.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/50546b6d2ea4951a1a419c7f46a460db/tekuxagal.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_off0000ff11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF11 10972 bytes
SHA-256: de7e936a9a82d81d811d888591326687ddb10a14f7ff41886efb6943eb144f53
font_01_sfnt_off00011887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11887 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13099 18248 bytes
SHA-256: 77cbf40a45c4c190b8d304b79306a03dff9ca1dac3994d1912c9f29ed3d17782

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