Malicious PDF — malware analysis report

Static analysis result for SHA-256 25d2943eb794e3fc…

MALICIOUS

PDF

81.7 KB Created: 2021-09-08 08:30:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5623c21cd2aa2a6208d510ed7c524e36 SHA-1: 8ef73b14f18a93ea32633c708def99a777f9848e SHA-256: 25d2943eb794e3fc9017a0ca4ae823df959e950f57fc1cc1d6ed5b5ad13fd777
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead users to phishing sites or further malware. No scripts were extracted, but the structure and link farm nature are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e1e436329---zuzonopatagef.pdf In PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/31h4aak4o5189tfk2fb6ibjqr5/fojapojakunanipoku.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611963c8989b1---baxikegukofabebibunexosu.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7b50a6c27---duxezegotaverefepivoz.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/q6dta6gk5496lau5r4rbrh8mh4/46754369328.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/82749002428.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d33986f93---kizex.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/poduxeposekusapuwaz.pdfIn PDF document text
    • http://17njl.com/userfiles/files/95259671765.pdfIn PDF document text
    • http://gardatrans.com/content/Files/wusemow.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/lawigibuduporoxepovafek.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0e38dace42---23218883640.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/80495c0732b314c4fd603910530f6a97/xomefazezovudasixenava.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/ko20vq3piu0beef5k4vdt8ipo0/32781108837.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/16935293367.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/d3bec6d70725db1477c5c85a1dbce650/fozigufunejazejefusosivev.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/lepidikixam.pdfIn PDF document text
    • http://renovator.cz/files/file/8001098353.pdfIn PDF document text
    • https://drlanda.hu/user/file/3459025762.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb6e9eedb5---37696927570.pdfIn PDF document text
    • http://accronline.com/userfiles/file/xapaluritufuf.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/cd996fb63e0871dc8195a4302d7c6a31/tidamed.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/1b2dab703446c6a176b2da75502aa72b/rababarusevesa.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/65be3b18215c5d16a5b68010425ec1ac/povagixirizawomebidad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=practical+non+destructive+testing+book+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_off0000d704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD704 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF16 18140 bytes
SHA-256: c40a3716579322c5d5ef17350218508ecce16e652655b69bd4c3665a9423687a
font_02_sfnt_off00011f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F34 11192 bytes
SHA-256: 936634d26724a7cf3222177252ce7ddfa013b4aaaec43512ac33e7f54cc25a3d

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