Malicious PDF — malware analysis report

Static analysis result for SHA-256 95281f4f14936024…

MALICIOUS

PDF

83.3 KB Created: 2021-09-20 06:27:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2f3dfb254be91c52029083e53642fc29 SHA-1: 370358477a7d128049b26e4d50ffeb95945d45cd SHA-256: 95281f4f14936024ccadd9234bd46975d96e41624adfe037b62a2fe0efaad1df
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple disposable domains, indicating an attempt to distribute malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document is designed to trick users into downloading a password-protected archive, likely to evade initial security checks. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hosungtour.com/FileData/ckfinder/files/20210917_44C25BD2998829FE.pdf
    • http://warwick-ems.org/userfiles/file/wozabodefidobawe.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d59a0f5e9---kizogefojezoduzuloto.pdf
    • https://menlopark.com/wysiwygfiles/file/nofalidewelu.pdf
    • https://tw-itemaos.com/ckfinder/userfiles/files/63243840919.pdf
    • https://nomaquito-travel.com/editor-images/39395975575.pdf
    • https://universal4shipping.net/userfiles/file/73033688165.pdf
    • https://spyboarcams.com/files/tanulelimudu.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161452b26d906f---54124669633.pdf
    • http://heatexchangersolution.com/upload_fck/file/2021-9-16/20210916050731523131.pdf
    • http://aircond.md/upload_fck/file/93221590645.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161478a046c97b---dureperetitoxofetesoni.pdf
    • https://atputasbaze.lv/images/userfiles/files/70748965151.pdf
    • http://dulwichtaxi.com/survey/userfiles/files/lamir.pdf
    • http://sasnowosielski.com/ckfinder/userfiles/files/genipadoz.pdf
    • https://lescourailleurs.com/upload/editor/file/68174756164.pdf
    • http://budgettranslation.hu/sites/default/files/file/lifemozafod.pdf
    • http://aqua4you.hu/userfiles/file/45324901933.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/koajv7ko6doo53m4mv03pbrct3/kuxige.pdf
    • https://mokshadhamnepal.org/userfiles/files/85652120085.pdf
    • https://tigaintan.com/contents/files/fujigakuvejuzuwa.pdf
    • https://ccskin.com/geektic/files/64111496910.pdf
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/rogijagibikekudaxaj.pdf
    • https://gameadvisers.com/js/new/fckeditor/userfiles/file/fukikoligizodewopemo.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356f09ec469---71353122721.pdf
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/38547293002.pdf
    • http://arohitourandtravels.com/userfiles/file/59255404191.pdf
    • https://faktxeber.com/resimler/files/xazixevun.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=dumper+software+to+hack+wifi
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de7c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7C 16792 bytes
font_01_sfnt_off0000f68e.bin
be09abc281e04e99de2498b7aba787846307a37eb148aab3ff3a43d5605045cc
pdf-font-stream PDF embedded font (sfnt) at offset 0xF68E 18272 bytes
font_02_sfnt_off00012626.bin
8e3b04d381a30fcedc2544a30f69e8e711cc5991fe87d621791432a3eecbbb7c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12626 10876 bytes