Malicious PDF — malware analysis report

Static analysis result for SHA-256 53faa59eb0eb04d7…

MALICIOUS

PDF

102.6 KB Created: 2021-07-25 21:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6791bb32704bbf2243ee3cc746bdab7b SHA-1: 15349b647c49304fae44cf626029fee36370d550 SHA-256: 53faa59eb0eb04d70ab77076de1848c24f6e13c7b27a27db99f3ace69f40a176
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was identified as malicious by ML classifiers and ClamAV, detecting it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised CMS platforms. The presence of multiple external URIs and link farm heuristics indicates an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.impactit.in/ckfinder/userfiles/files/wezenobajixak.pdf In PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfc64dfd1f---53634214843.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/forofofawupelumezen.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081b35d33379---ginupeja.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a080bdedea1---83032035776.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/58771409229.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/36303204655.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/49380725847.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/26867704715.pdfIn PDF document text
    • https://ka-base.no/images_content/file/kusenokudowemabeve.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/jurujegisexawujirubav.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762a50cf7da---linivurasedubopalizavab.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/8mhj971rvoc2n66sskbbt5hlc9/mafuwupiweg.pdfIn PDF document text
    • https://artbynela.com/uploads/file/wejiravozalose.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/65316977995.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16076a0083a264---rolaxifaxobepolepekoru.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/fa1cb675d76cd0dcec4a5b187fcfe0d5/buvujosedebegufifadezis.pdfIn PDF document text
    • http://candientuvibra.com/images/file/70019944756.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160abddc365fc7---63894254716.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080fb62b5d90---69631074275.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c64ac04b30---52501573723.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4833dcb18d---12097260529.pdfIn PDF document text
    • https://rotterdampools.com/contents//files/zunuzuvid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=etica+para+amador+fernando+savater+resumen+de+todo+el+libroPDF 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_off00012b1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B1F 18220 bytes
SHA-256: 63fa0a0ef65349d40d565d7eda0cba885cb17fbb29ce2433e5ac5f3e891bd808
font_01_sfnt_off000158d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158D0 11072 bytes
SHA-256: 29158e5b4b552f6236322c52d41c298db1a7586e7039abadd3fb8637ee79e51d
font_02_sfnt_off0001726c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1726C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1