Malicious PDF — malware analysis report

Static analysis result for SHA-256 2edc9b98cc031cb0…

MALICIOUS

PDF

84.2 KB Created: 2021-09-12 08:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ac75f43bb4d1eba10a1fc112e68cf42b SHA-1: 4a0b4cec57ae08a2a900185a69ceddfe653daf3b SHA-256: 2edc9b98cc031cb04b170c766e2c8f5e0001c9c8e39da7d8a260c9c622a3df3a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised or disposable, suggesting an attempt to obscure the final destination or leverage compromised infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://yasacompany.com/upload/files/81658102420.pdf In PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/pafewutalujagesemob.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/86013400054.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/50024779622.pdfIn PDF document text
    • http://orthopediedelft.eu/files/pixufemazepetowutitud.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/jakikori.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/91548168644.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/27975140329.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/novekemeguwumu.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/xidasaragu.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/44248fcf3e65a1753ade4743777c7587/bixunizojaluwuj.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/togojudulawubupifedoga.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161396b8899ea6---70952933677.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///gelovawunu.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613066a961a15---jesila.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/zenaxeg.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/9361590734.pdfIn PDF document text
    • http://cwpni.com/userData/ebizro_board/file/lomutisikewane.pdfIn PDF document text
    • https://cncunse.com/d/files/14890428314.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/xuforapezexesexedot.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///11226232134.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/tajamijozakakugebabiriru.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/ligoniroxat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=tizen+vs+android+tv+vs+webosPDF 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_off0000e4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E3 10512 bytes
SHA-256: 54204c7d58cfca4592c46f4707ae923702d119959913f61eb9c686f91bc57a85
font_01_sfnt_off0000fd12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD12 17948 bytes
SHA-256: 78dcf5935c1d41c0dfb254516fbc5a3647bec6a4597b0b68b609f22b256e0df1
font_02_sfnt_off00012b15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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