Malicious PDF — malware analysis report

Static analysis result for SHA-256 718472c29283d51a…

MALICIOUS

PDF

70.8 KB Created: 2021-10-03 07:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 005e8d3a3c64a1d0ddbb2d26ee6432fd SHA-1: a3d1fa0c891ae8d7defc5bf80d35789a6fab9cbe SHA-256: 718472c29283d51a543d816c06891089b5b3b550c751e3803a90c00367b192cd
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as link farms on potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate maliciousness, consistent with a phishing or malware distribution scheme. The primary attack pattern involves luring users to click on these links, which likely lead to malicious content or further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://egyptlance.com/userfiles/file/54762276420.pdf In PDF document text
    • http://vandientuchinhhang.com/upload/files/61000714041.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/27835197296.pdfIn PDF document text
    • http://ekmeta.lt/failai/file/82433070120.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/bomofiwomajutojovozegafit.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/74496350034.pdfIn PDF document text
    • https://xtremefitksa.com/ckfinder/userfiles/files/21001350156.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/75447214189.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ec9a42c63b---sinabowoxozuzutobij.pdfIn PDF document text
    • http://cresapumc.org/files/file/99648989171.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/xepen.pdfIn PDF document text
    • http://techbis.pl/files/file/wenupaposode.pdfIn PDF document text
    • http://erago.cidees.com/uploads/files/xosibid.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/145469711.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fb9bd76fe4---99398895191.pdfIn PDF document text
    • http://consade.com/userfiles/file/domuwakavajivutegulev.pdfIn PDF document text
    • https://estatecambodia.com/htdocs/cljr/data/files/getuwovijalujolov.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161337b44ab72f---90951620353.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/613f15aa7137e.pdfIn PDF document text
    • http://sowiik.pl/userfiles/file/14417406681.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/fdcc10e89ed4fdb01048567c841cfa4a/pejabovuwibojazikowozu.pdfIn PDF document text
    • https://sunsetlearningcenter.com/userfiles/file/mukevemonilatalu.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/u46si5oeh0fr54lhjv5qqtc0h2/61294447761.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/gawum.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/rutatifubasu.pdfIn PDF document text
    • https://coil.hk/upload/files/57539166028.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/saveligas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=blood+transfusion+is+not+possible+fromPDF 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_off0000b56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB56E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD80 15244 bytes
SHA-256: 3bf94a9db12b63b57a212dd020b6ffae405ab3d8860bc08619ca20e9d0d153db
font_02_sfnt_off0000f3de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DE 10952 bytes
SHA-256: 380af547d8ba30caf56f4871d547e39929d3e40ab705971fbd7dc2b23a9db858