Malicious PDF — malware analysis report

Static analysis result for SHA-256 6240b18cd0b9229d…

MALICIOUS

PDF

84.5 KB Created: 2021-09-15 14:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 947432ac0fc88b6063422b81f9b7fd3c SHA-1: 9a69f5a2a0038939e1734b161ff68fdaf99c227d SHA-256: 6240b18cd0b9229d01d72bc079fe79aed09f38fb24f7de9b65cbd7e2df19048d
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm with numerous URLs pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farm heuristics indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://philabc.ru/uplcv?utm_term=android+live+wallpaper+engine PDF link annotation
    • http://sethhukumchandschool.com/userfiles/file/71562539502.pdfIn PDF document text
    • http://www.painters-restaurant.com/userfiles/file/laweruva.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161416616377a4---5829173797.pdfIn PDF document text
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/65414306433.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/userfiles/file/75371020394.pdfIn PDF document text
    • http://tech-sub.com/userfiles/file/17873864680.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/tuvezub.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/aef3ebb4315224fb270f447407945d70/kobizeb.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/90038041397.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d2646c185---68536213431.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/75484498093.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/96082624010.pdfIn PDF document text
    • http://terrietanaka.com/library/files/banux.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/nelonup.pdfIn PDF document text
    • https://value.ae/userfiles/file/96622168131.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/tumasuribemamenilabone.pdfIn PDF document text
    • http://synowka.pl/galeria/file/wapuzuvi.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/67819384846.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/kuvobegenumapaj.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/popuzovekemajawodatekow.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/72247032780.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_off0000e4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A2 18624 bytes
SHA-256: fe1fc3bc0bdbeaa489444750d85c770762547eaa2655eded10040900e541b293
font_01_sfnt_off000114ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CA 10432 bytes
SHA-256: aec1fb0c8e1add04c9ea7cb0ac61acf69acac7ddde42c622199da9890efbb18e
font_02_sfnt_off00012c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1