Malicious PDF — malware analysis report

Static analysis result for SHA-256 fce08e493357de5d…

MALICIOUS

PDF

69.2 KB Created: 2021-09-25 00:30:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7f11d5a250f938780124cd08cdb9648c SHA-1: b9c8cf38d392b0fa73684ffa9e210094564eb46a SHA-256: fce08e493357de5da10c11c65eddfc171ce0d41fad98f164a37334c0f4ce640d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm. The embedded JavaScript likely serves to execute malicious code or redirect the user to a malicious site. The link farm, hosted on compromised CMS uploads, further suggests an attempt to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=pisiphon+for+android PDF link annotation
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614217a40ced7---18841403499.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/vutusakojidafijogumejufel.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/15799501852.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/fukesovepamul.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/razoduvedat.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/51723233416.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/jezeva.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/duwukamazarosedujomunafi.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee78793f57---pomajetasodinaka.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/tuviwoxidexo.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614d90998d413---20608588110.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/6810221026.pdfIn PDF document text
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/25107708749.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/89163396524.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/nirewawefotidonomu.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/tawixuxiru.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/98215971416.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/62jvlc25d1bme82q06h8s8vi0n/gurur.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/sozejamezowuv.pdfIn PDF document text
    • https://egca.fr/userfiles/file/63356626160.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/10724111747.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/87752447842.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/damimumine.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_off0000b1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D3 15208 bytes
SHA-256: 689e5d77a5d162662d1289fd2bde8d4ef7c534d4e37405ec8864d180a7cafc5d
font_02_sfnt_off0000f014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF014 10320 bytes
SHA-256: e3cbc6b2821fa5aa0ca23be357ddbf24b396b1d8b543422776412c722746c018

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