Malicious PDF — malware analysis report

Static analysis result for SHA-256 40b2472b8cf2bcdf…

MALICIOUS

PDF

77.7 KB Created: 2021-09-18 04:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d16ac7fd58d6ea3b614c75cfad2d1e89 SHA-1: 9b84ba48bca5d8fdaa47dc455c5731d6e8785d89 SHA-256: 40b2472b8cf2bcdfc0f11b93f24fed987c9db5cf1f3dd804cd7a0e234159e120
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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 http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/707603156.pdf In PDF document text
    • https://kisikana.hr/UserFiles/files/lonulozedaxowurub.pdfIn PDF document text
    • https://heyratacademy.ir/file/6503719091.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/026862490ef17e1dd34b27b146390467/posoturazijolupixil.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd6b9b0918---menudilaken.pdfIn PDF document text
    • http://royalgroup.at/tmp/24714090250.pdfIn PDF document text
    • http://olympusflights.com/files/files/10465086207.pdfIn PDF document text
    • https://tessuno.com/upload/files/613a94804987f.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/54780786105.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/tebutapadovodevafakor.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/kujuba.pdfIn PDF document text
    • https://ventadeterrenosagricolas.com/userfiles/file/vegezelemenalepenavidana.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/161404b08808b2---merefomidu.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/42487398356.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/62726014273.pdfIn PDF document text
    • http://findusafranchise.com/files/files/nezaxaregizopitikikuwuti.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ace768d7db---jinededupovojegugazexi.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/buruvakepuselafuruzuvofol.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/16821293664.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/45656980492.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/wewonez.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/gexedilepazit.pdfIn PDF document text
    • http://orthodoxnews.us/file/vozom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=analyzer+wifi+androidPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB330 20140 bytes
SHA-256: dc1a64977fe8b63fb7604321ac3db514fcfd30d7530e523e4997353427238c8b
font_01_sfnt_off0000e42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3E 16148 bytes
SHA-256: 1c024217ce21bb66922f73502146d3c7616b47413e2e194c36dd680b30e64e78
font_03_sfnt_off000111cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CB 10320 bytes
SHA-256: c516e2fbaac9ed5b8053cef31dee0471c01afd4e71f4fcf5ca798c7172b22c67

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