Malicious PDF — malware analysis report

Static analysis result for SHA-256 e90276456d1b52ad…

MALICIOUS

PDF

87.4 KB Created: 2021-06-25 19:32:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a7735d2ae7307e5352be13f34c7d1820 SHA-1: 81aaa38a4ae10362bdbc39ad1a9ab8246707dd56 SHA-256: e90276456d1b52ad9f51ef1026fb6136cc43599309f95c882fabbcf60c82f1a6
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm patterns, indicating it is designed to redirect users to external websites. Several of these links point to compromised CMS uploads, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection further support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://huntic.ru/uplcv?utm_term=white+snake+in+dream+biblical+meaning PDF link annotation
    • http://stroisvias.ru/userfiles/file/34662122118.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5796998a6---dezidinutaledun.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/gozapuvuroran.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/136010e153650d3fd0526d585dee1681/14947353386.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba876e60f---kikivuzelu.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/6hkqm7hs0b2qodmcqb69ltovd5/12814320802.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/mt926idmv17hpc4gvi8d0ou9m5/lowekefuru.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/zabinepumiwotegijozadude.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/6no6mga5rm3pm4qf7o47kbl4o1/49404450878.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/7429c54f015e7beea559693c739cc010/ranifewolapafegozata.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/lefutigosolapamifufef.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/o9r4qm5gra28uoh32ru9t25qvt/gotukekatal.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/78312338380.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/45353996378.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/7dc6c22d1d716a5c099fee80763c35cf/29909141477.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16095a75e15f83---ludomemolorojiwezeru.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda1f3905f3---15220548055.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/juvopuvuxojikubarafekupi.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/b8612cc11c9ba9904b938e21901c95c3/89394055615.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608550db9e279---sakuramutenibiron.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/pfvms0c71j86iqcsdf5lpld42b/91148432213.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/981005b1bcbf3db694a539e543465a2e/jimunufimufaw.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/682d846e0a996e392f50973e35c4acb2/geguwanizakupapeveridex.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/fichiers/89898955586.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/bfe113133c32f93370944b324a9436f6/82275152039.pdfIn PDF document text
    • http://vickerycarpet.com/uploads/images//files/libopomaf.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_off0000f39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB2 10924 bytes
SHA-256: 670548ff209b5b41e4d1046d7f6372d06778a948df3c1ec4e2b3b855ecbd4c1b
font_02_sfnt_off00012497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12497 16736 bytes
SHA-256: d148e98eed9157331ab9d7fb42e3c12900620e71747288511352f7ce9cb16b57