Malicious PDF — malware analysis report

Static analysis result for SHA-256 44d5195d9552318a…

MALICIOUS

PDF

79.4 KB Created: 2021-09-05 02:18:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 44041ff31ab3617358df33b60f71b8a1 SHA-1: 575d96abbfc32f0835002442c675de161b15bcaa SHA-256: 44d5195d9552318ae57ea665decee2a5720dd0f1245c12f4f610b226724e9380
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inwebjor.ru/uplcv?utm_term=court+case+management+system+pdf PDF link annotation
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160920e1d6f2c7---lufaxuziwidebuveki.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/tukaze.pdfIn PDF document text
    • https://paradigma.bg/uf/file/21514555367.pdfIn PDF document text
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/93191503540.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/28539184040.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/junixaxowumekadubudi.pdfIn PDF document text
    • https://lufty.cz/UserFiles/files/fukowidoxeweresu.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/481cb86d9cc4b467910b98351e156ce7/20614015813.pdfIn PDF document text
    • http://zl369.net/userfiles/file/puwifijarubosodudumebezim.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210714_091005.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d4ec12b342d---tepugapu.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/0v3r0nptln9crs8o9nk3tu27jj/sopatad.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/06a7212a44b2b39464edfc908c669b30/93299649370.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc8b03075d---gilidelululujib.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/rupitibezofotoselulaj.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/vopimumopesama.pdfIn PDF document text
    • http://sl1971.com/clients/5/51/517263f0417f9379c67e6eba0e0bdfe8/File/55899930034.pdfIn PDF document text
    • http://hydrem.ru/images/file/18885312357.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/naduxujafizigipazogap.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/u0h8fofjhi2bqtmf53hh2mpv92/fotutemavegukapab.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/cf521a15ec87cdc1f239430d48a2ab68/fisovajenijogalunumekelu.pdfIn PDF document text
    • http://www.asslar.de/downloads/zaroroji.pdfIn PDF document text
    • https://csodamalom.hu/files/files/nidofam.pdfIn PDF document text
    • http://nebo52.ru/uploads/files/sotikab.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_off0000d6a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBF 11072 bytes
SHA-256: dadd244dda98df24149aa90e671108e16ce2c75a58e8f368ac4461903f29faef
font_02_sfnt_off00010870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10870 15344 bytes
SHA-256: 6044a0072c1ba5c835f4ec74a715d360aa94a106cd1e621d5a3fca8a2753b2e3

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