Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0b312cdba519b8c…

MALICIOUS

PDF

84.1 KB Created: 2021-08-18 23:31:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: daef484e65f5fc2e8639d1297fa84fc3 SHA-1: 46c56eadf14cfdaea204a4ae5151ef086307a6b0 SHA-256: c0b312cdba519b8c59a491a09790bf9b15269cf592557844200be3d259f5265e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on compromised websites. These linked PDFs are likely designed to lure users into downloading further malicious content or engaging in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://dalnoboy.org/data/filestorage/upload/files/nobar.pdf In PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088d4c9b2963---lutawefokerotera.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa69378bde---33657813153.pdfIn PDF document text
    • http://szwygs.com/upload/59352288236.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/be28e602f6c3ce8d713b45f577b70d1b/94391084629.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/6ncei4cphsd16i2el9oev7vah7/7904225070.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/d54jgoml31p3pimm69k29m23av/tebavarilek.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/tuvaposabukuzivagukezepu.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/70959836536.pdfIn PDF document text
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/74223571671.pdfIn PDF document text
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/f924ff954970d621d4450d18eaf68873/99324690766.pdfIn PDF document text
    • https://pcetravel.com/files/file/zuzajuxapatexazi.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/filudunutozopadotixi.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/1d40837f34ad69128995738a333b4c3d/tirikemiwutezapozafodanap.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/20017051127.pdfIn PDF document text
    • https://avenue102.com/uploads/file/sapuxaxunibupova.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609839aed8b41---74276699688.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/2437248908.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/90206402434.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/379c8823ffbf7549ec57bacbad445745/vilalodutekexabolavakuj.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607373e1264dc---27913917760.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/pozamupitozovotezodilew.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c02f8783820---71114235264.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=what+are+the+amorphous+allotropes+of+carbonPDF 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_off0000e0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B9 10888 bytes
SHA-256: db0f69064c22b6d701035a66379133031f18f2d2328974f35a2209cc0aca7607
font_01_sfnt_off0000f98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98B 18896 bytes
SHA-256: 81b5437d841158b40b50e0dee2f492ce1a3b2bde9f0de74e3664b2ce1de440c2
font_02_sfnt_off00012a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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