Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1d52c08b1b94732…

MALICIOUS

PDF

74.0 KB Created: 2021-09-07 22:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 089762c2df26023b7bc035c0e80abd52 SHA-1: 524708ef0688da056d5f6eb308704b01613ad8f3 SHA-256: a1d52c08b1b94732e0788aecdd8cc4b48f138bdf9c79f09145ad11e9e94fa11c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on compromised WordPress sites or disposable domains, forming a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code or initiating redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

Heuristics 7

  • 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.
  • 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://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/d3aeb74vgi6bnj49cfmc7m75u7/65625353482.pdf In PDF document text
    • http://hanasushimenifee.com/uploads/files/36976521412.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16233946133107.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607767b8f31fe---fafetosunomivuro.pdfIn PDF document text
    • http://autavrabek.cz/obrazky/file/8822015758.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/vajudejuxobuji.pdfIn PDF document text
    • http://tischtennis-kiel.de/images/file/bamisadonufus.pdfIn PDF document text
    • http://izdepskifamily.com/clients/1/1a/1adacdf247316bc4617b3617d965acc7/File/wiwezemu.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/07dc1d6435c4c679dad59383491ddd7d/93934644142.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/30951838150.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//gatebijav.pdfIn PDF document text
    • https://lapakunited.com/contents/files/nidilebovamese.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/9e84041cab1ffb14e69035ef8a029ba2/73223629518.pdfIn PDF document text
    • http://canadanur.com/resimler/files/jebufeji.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/50388531530.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/epm2t36lejd3i5ttgjj8d6icns/96679192443.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5074f18d4---68096730723.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/47812119724.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddac8b2725---nufobuwufusefo.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/d790f21c9ba4e03a956ce048e44cd27b/vuzirelibotelideduj.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/41598663774.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/xaruvo.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/roferimevosakixud.pdfIn PDF document text
    • http://jafra-com.at/userfiles/file/91415374633.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/95149262416.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccfb7850052---27218014173.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=linear+algebra+schaum+series+pdf+free+downloadPDF 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_off0000be8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE8C 11252 bytes
SHA-256: 99771b0f35cf48614b5aae3f50b2567f55d2c9993995ff488db7912ea5ce431d
font_01_sfnt_off0000d853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD853 16116 bytes
SHA-256: 396181c470fd70f9938d453f95f2b5dd72a6f7da9f84a9ba90ab6feb35471e21
font_02_sfnt_off000101af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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