Malicious PDF — malware analysis report

Static analysis result for SHA-256 9acea62b71bd1f43…

MALICIOUS

PDF

86.3 KB Created: 2021-09-02 07:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 954a10efccddc1fe0e5831d10cd4cb67 SHA-1: 154fe208c3b89e071a25256c01ed5e2be764ff56 SHA-256: 9acea62b71bd1f439d0d9d339cc80ee246a60a2687744e615978365c66d80d04
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or manipulate search engine results. While no scripts were explicitly extracted, the nature of the link farm and the detection names suggest a phishing or trojan distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbd0bd1c40---denamibagavo.pdf In PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/4b3d651c05113a071ccd451a72dbb30d/17487004391.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161188ab4bba37---53970777782.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3e12b4e42---45960556592.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc02b98f3b---gufeno.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/tutume.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c3b354b4b5a---80096268956.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/2fs1dp09lkn93t7biqnbf9612e/19482617830.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/8l981rf9e4ihcf4o1s53r9gf63/48648612683.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/tefumumopojunaxebomufose.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607011062ae63---wawutipamuwajabuk.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075098c96e36---pagexereguni.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/movagexejanojivetiwa.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/37192966430.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d905e7c6b---vezesaxowukodebilob.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/72va633dojhmkg1ho5qaighlgh/debive.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/rovaturibafojokasale.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/99359201755.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/nebakavipuf.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8e8604604---donagolubutakikozefameme.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/ea15f273cde92fcca605c9fd4faf5ddd/velegapelovopoxawos.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/34494301422.pdfIn PDF document text
    • https://servicepapik.ro/files/vemoneriloxez.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/eaf71ba9f5fa1b2eec7ee7fa845207f0/74821611540.pdfIn PDF document text
    • http://konyanincigkoftecisi.com/userfiles/file/vuvorutox.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/rlg276hc2n8ueepdl2a5hh1tfa/98566716445.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+get+through+wallace%27s+gymPDF 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_off0000edae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C5 10808 bytes
SHA-256: 3c2cb3a6ab6f4691a563d150ceba1dbae1cede6ace5498285d1faef4b7dd119f
font_02_sfnt_off00011edf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDF 17156 bytes
SHA-256: eff37820ce97d69cb6cf0ccfe359a754b70f84767aec653317fac2e8776b4111