Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8f11e1f556b3d37…

MALICIOUS

PDF

77.3 KB Created: 2021-09-05 14:19:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6f4472039b6c91efc313036f20cc4289 SHA-1: a42060bc9e2cf91e930b8365851c77318fb2fc89 SHA-256: d8f11e1f556b3d37b3f399141171fe7b02c678a94c5b4ee7412e399919154ea0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute phishing or malware. The embedded JavaScript likely facilitates the redirection or download of malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/97fda31230938fae04c2b55ea9aeae48/70278774579.pdf In PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/tinakudesuk.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/jogusodusepuropako.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/papoz.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/gojerilixuxakidudaso.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/e759f67db056136d54bd8f1e27ba147c/59931485833.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f28f2476b4c---8291672237.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/20364202045.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160abd99fe55a4---xifusede.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/venumum.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e5a070940---74139284150.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/bazixema.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/71421375742.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/kapimatekoviduvalivowu.pdfIn PDF document text
    • http://expresskaliski.info/file/11480629984.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/sdqaahtmr65mn515f6mqts9656/wifowigar.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/fjft0u2cato4r90bq56loe69m5/retakewakizit.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d28086c531---15454776689.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/92476480020.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210709202352_65u7sb.pdfIn PDF document text
    • http://point-grey-1970-grads.com/clients/f/fe/fe7686cf254963525dc0bd811951f15e/File/61870365393.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/98458fb05d19e75939d736dbf1190fdd/18138206302.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/zexotum.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/98194781460.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160ec459223532---tesabaluruvewebuzafevuvil.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/joperowukuxede.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/jtah9pisa10qo8k0mb0rded4cu/51275070942.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=sap+learning+english+grammar+pdfPDF 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_off0000c4ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4CA 10804 bytes
SHA-256: 4ad1b410ade7474ec115a5c60547efb3d825124544058c8d736f28ee64d9040f
font_01_sfnt_off0000dd2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2B 19244 bytes
SHA-256: 2dc064c9d2f69ee646b989e9c181c8ae4aa9b20a740cc8b5b4ff142f06ec9e2e
font_02_sfnt_off00010fb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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