Malicious PDF — malware analysis report

Static analysis result for SHA-256 7eed440c78781ebf…

MALICIOUS

PDF

79.4 KB Created: 2021-09-23 23:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 096a19c7318f0b26944718c8c5d7cca5 SHA-1: 8242e2861d83e1bb6a924ae9a770307a4d4ac7c1 SHA-256: 7eed440c78781ebfe4918127e52999ba6f2b44c6baedfe54431f5f553b2fd6ef
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous domains, many of which are either compromised or hosted on disposable infrastructure, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs are designed to lure users to these potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://dotykbylinky.sk/_subory/subory/zoledezagodiwin.pdf In PDF document text
    • https://edubox.mn/uploads/users/0/files/76180940480.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/jewunakojewejoxe.pdfIn PDF document text
    • http://mbeautyconcept.com/upload/content_images/file/zelijisitar.pdfIn PDF document text
    • http://grimastone.ru/files/regovozevudozoliw.pdfIn PDF document text
    • https://etimes.mn/uploads/files/sesupepofima.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/40640948884.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16141eff317f5e---mupunukawupupovexovofeda.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/7dde9d02060efab7fd455943a0fe71f0/mevaruzaxirejemuvusitu.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/kudezarozukasozu.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/kotiruxuberusiworarodef.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c14f2865ba---53125297196.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/xigimegexax.pdfIn PDF document text
    • http://cnex.cc/images/blog/file/dedubepikojosakogovorefe.pdfIn PDF document text
    • https://hkki.org/userfiles/files/lubewevirotorifiz.pdfIn PDF document text
    • https://siltri.com/fck_upload/file/rewaxakubefaxudo.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210902085005.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/lenotumerebapavubo.pdfIn PDF document text
    • https://sharks-cz.cz/images/file/rofinetenosiworaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=search+android+messagesPDF 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_off0000d380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD380 17168 bytes
SHA-256: 51b0ac2c7c6b329b1972806a43a9e50040e064c292d655d89d307f08096d8483
font_01_sfnt_off00010007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10007 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001181e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181E 10748 bytes
SHA-256: c48fee68cf80bcbf8a5aa058af239be8636c94043593e7b6266bcdebcaf1e86f