Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6c922e6f8cab296…

MALICIOUS

PDF

81.4 KB Created: 2021-09-18 13:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6f93fce2144ed4758ed150fd0302858b SHA-1: e4c03730f27ce0c8e5749314817f135fbec1c640 SHA-256: e6c922e6f8cab296b6227ad3d71303ccaa5b5dba32cd9b8a32e4752db0d61ce4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites, which are characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • 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 https://allytemp.ru/uplcv?utm_term=best+pdf+reader+for+android+without+ads PDF link annotation
    • http://sushi-belovo.ru/files/556294197.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/96782569176.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161378e5f89af6---repaguwaverawazoleb.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/89589794607.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144c657e4fa6---gawekigolebitirudazenu.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/92992978491.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/bd32ff7a84079d8c0f21ae9d65be8db1/korena.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/58594647804.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/wegipavuvibumoj.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/gusakibonizixitivijava.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/41212911443.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021090916043180.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/wutigozalalebipanoxam.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/c59568e3acc7ae9bf8fe64ffb21e28a5/nefigovisetoru.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/komozoxutuzexarejewu.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/58195238a83119d50c2624728572803e/dovaxobapenukinalaxa.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/9ve3184nsfr5ojnmlvnbgn8vo2/78841154870.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/sotiraxujolokavetenenamob.pdfIn PDF document text
    • http://haai.org/upload/file/rapafugapifeg.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/rotugoxuxawewixinowumuba.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/gudigoxu.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/4789806861.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_off0000d80b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80B 17904 bytes
SHA-256: f334239f7f71c49556e4c1cd3f9653af5380ad6d293977a8d8269b62dc99d571
font_01_sfnt_off00010681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10681 10788 bytes
SHA-256: 8882b641811b68b1e28ee200d147fc2168d5fb0919cd7025e757507460e73875
font_02_sfnt_off00011f66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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