Malicious PDF — malware analysis report

Static analysis result for SHA-256 4827995c744ba8b9…

MALICIOUS

PDF

105.9 KB Created: 2021-08-04 05:42:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4616d27a1d358a7c1f92a8eff795a91e SHA-1: 5e7ceb11022e635cda5b9bff6d5f430abd9967d4 SHA-256: 4827995c744ba8b9310737ba70cce3a3a602494729af3f1f376862637cfa624d
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external links, some pointing to compromised websites, suggesting an attempt to deliver a malicious payload or phish for information. The presence of a download button lure further supports a malicious intent. ClamAV detection confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ivanda-commerce.hr/userfiles/file/54412124067.pdf In PDF document text
    • http://air-ned.com/uploads/files/zisobuwot.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/96371459269.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/falez.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/mqu2nf15eq6bsvaclrn1atiqlg/mubiloxobetivux.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/81221918531.pdfIn PDF document text
    • https://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/p4jurpl2m98ujn91pg1oria6b1/51053472325.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/77608673459.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/76782226558.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/vatigobugida.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/lokifesiripebax.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ec64bd23e---kabagogulekakuvet.pdfIn PDF document text
    • http://ruiqingchem.com/upload/files/dopuxapagofuneko.pdfIn PDF document text
    • http://farashimirooz.com/files/12230806251.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/mewifudo.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/v9mikgpin0bbbkpdtbnblbc9ft/52151784222.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7f1d38d28---zaxuruti.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a030e03f62---97533747253.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/80510849429.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/noroz.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a5ac8025a---88205352384.pdfIn PDF document text
    • https://laps.pl/userfiles/file/65847269901.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/kepose.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/d6vem1rm3pcie5ccr300poafa4/82086533680.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=entrance+exam+questions+for+class+11+science+pdfPDF 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_off00013910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13910 17492 bytes
SHA-256: 5c93caec65a609d752973d8b3da577e4c56ef2eb7efb12e5d48403ebd80821a1
font_01_sfnt_off000166ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166CE 11164 bytes
SHA-256: 80820a1ba21ad1952cc93bce428346f1eb75905e45bbc74ec2978217dd25dbef
font_02_sfnt_off000180c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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