Malicious PDF — malware analysis report

Static analysis result for SHA-256 2de98b89cb78e635…

MALICIOUS

PDF

86.0 KB Created: 2021-06-29 21:22:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 4e917fa8425a66d28e13db01e289ed3a SHA-1: 3f6b724fc9cea3556703c24751ddab6495929e7f SHA-256: 2de98b89cb78e635e3d87ea4eb3a6c447bbaf6133d359eefa73cf661b7d7a87d
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF containing embedded JavaScript, which is likely used to redirect users to external URLs. Several heuristics indicate the PDF acts as a link farm, pointing to compromised WordPress upload directories and potentially disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://medvor.ru/uplcv?utm_term=bsc+1st+year+syllabus+of+chemistry PDF link annotation
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/nd7qhgubqkqefi3fijdk2l1r0k/79473900908.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/kefadi.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607179b932c4c---59710013261.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/femutol.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a21bc86bd86---87717664248.pdfPDF link annotation
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083eb3765984---dekurawesuk.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3a785351d---satexujisujuge.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/kpjcj5ua4178522ss2mccag8mf/buwisoparu.pdfIn PDF document text
    • http://gchs1969.com/clients/867877/File/nuxovotubepikan.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e92e00e58---49973770655.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/205466d660d1906707c88ded966155eb/6175530334.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608eccfe6006e---46263213674.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/72471e2d7e241ab765f28e3809d77cbd/85959377271.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0289a83e5---38088259694.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/22950397848.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/f6b7e7a42ec6d47af5bfc59fe1945df9/56347030167.pdfIn PDF document text
    • http://geobrofab.com/clients/d/da/da7cd3953015cd63472398095fc1fcdd/File/gexajawus.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/tofaxonuvaga.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c0420414f---95971659185.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/70982869376.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/qd1vj5a4op7fu26m763o50i97r/busilato.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/32956372363.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0c12d2ad7---ziwagojesebalobukafeb.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_off0000ebe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE5 10956 bytes
SHA-256: 2f9347aa5f90aae9964e50d5195b3f3245d4659a023cbd3a4b32fcd1b9493ace
font_01_sfnt_off0001056e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056E 17260 bytes
SHA-256: 0e5ab66bd184cae0083d96bdc3d2d19f4152e0a3e192efcd760f888b13c8df90
font_02_sfnt_off000132c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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