Malicious PDF — malware analysis report

Static analysis result for SHA-256 f66adeda0dabce32…

MALICIOUS

PDF

78.4 KB Created: 2021-08-31 14:29:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6a0635567ede08032e5b7902d76f1133 SHA-1: 8e5e5cf65e8ae620563fa24bec0afa2c62bb1474 SHA-256: f66adeda0dabce32c13564e0789129fe48cb5ffdfb4773988f314f365d97a43d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. These URLs are likely used to redirect users to phishing pages or download further malicious content. No scripts were extracted, but the PDF structure and embedded links strongly suggest a phishing or malware distribution campaign.

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://allytemp.ru/uplcv?utm_term=plato%27s+two+worlds PDF link annotation
    • http://lamekatus.ee/uploads/ckeditor/files/39250143344.pdfIn PDF document text
    • http://wedding-ideas.ru/ckfinder/userfiles/files/lumeleze.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/niviposobifowub.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/webemabinuzu.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/64123989308.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/20a0c4f4b93cd4e2e3242444f9395ca2/73840506358.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160a59a7345d11---vepuguzora.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/8902c023a6e0f57399730045851ea36a/74814971511.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/67676924339.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7ca230c3a---wevesijivimowem.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/53319063800.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/sulagatu.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/sepenonexoxunedibixu.pdfIn PDF document text
    • http://saydersan.com/firma/files/31439593781.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6cd612bf6---88848363617.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/lamedegituvapaxokudav.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/b5e2e3745e265d460173ff3baafa4aec/lovewidijanisatezu.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/152159130760a5aad40f855.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/4li4aaangn950joijddfirpld2/fozaxapifem.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/novolusanaposap.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/95ff1d2d476f0d52a015403fb8493c54/lisurudemesinigitoxeganog.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/muzarixuxosularixagorire.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/65636335234.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/61488538608.pdfIn PDF document text
    • https://huanghecables.com/d/files/xavovevutafefu.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_off0000d359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD359 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6B 16560 bytes
SHA-256: cf5657b8a6342a60ab6ff84192cccd32709c76fef64a3fefd55f8c80b59d87eb
font_02_sfnt_off00011577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11577 10036 bytes
SHA-256: 14ab5ebac22e448d686e984055b0375d24a54a4389319648199c3beddb21c8f8