Malicious PDF — malware analysis report

Static analysis result for SHA-256 f35c52231cef98c1…

MALICIOUS

PDF

86.3 KB Created: 2021-09-23 19:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cae2cfd01442886ff0cce923b844c692 SHA-1: 0fca7f0fb40b156744f2b30d36e87e3017cf8d04 SHA-256: f35c52231cef98c1d2ddd3f0a5ce68ce85e6b3aec573eadcef91223c089ff877
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=compass+for+android+phone+without+magnetic+sensor PDF link annotation
    • https://foodvellythailand.com/upload/files/44623743726.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/sezizoj.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/56688538619.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/7462435919.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133b569ec9d5---19913675070.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/70840823147.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/95626630397.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/tafifipujekelazobi.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/25307261208.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35491597955.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/60420112470.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/4656430012.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/70282875249.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/xires.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/39223909439.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/machihbncg35h0njacrovp40lu/xeberoxokenemumaju.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/43996238892.pdfIn PDF document text
    • https://designclarf.it/file/lawabiwi.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/porivesidajuguwo.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/didikejulara.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/50698613997.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/89288184533.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141289345097---rijebadokuxuzakikivis.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/zovipava.pdfIn PDF document text
    • http://coca-colalife.eu/userfiles/file/89522084630.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_off0000ea5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5F 17748 bytes
SHA-256: 8bbb7a375970dfdb442819cb295f30ebdb966f92a86a4f4dbeb7c6337bcd6e8c
font_01_sfnt_off000118e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E1 11240 bytes
SHA-256: 27ce3c7605163909ee46d7ab33652229c7836fe5659e525ee606b9102655362b
font_02_sfnt_off000132ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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