Malicious PDF — malware analysis report

Static analysis result for SHA-256 fed2b2cbb99187a5…

MALICIOUS

PDF

84.9 KB Created: 2021-08-07 17:18:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: b680aebf5e87401d1af290a7e73dd9cc SHA-1: cc58bd8cc68a4d92b46b35a89209097d0d36a55c SHA-256: fed2b2cbb99187a56db9f3060cb038c0272d308b722b5253ff8d5ca273ccbf0e
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be part of a link farm hosted on potentially compromised or disposable domains. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade gateway scanning. The ML classifier strongly flags this PDF as malicious, suggesting it's part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 6

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=descargar+serie+chernobyl+hbo+latino+1080p PDF link annotation
    • http://veraschwemmle.de/fckdata/file/dijuvipizodil.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-6/file/denujokefolutezojaporo.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/38405634958.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/98555744232.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad700d996e---5174045143.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///50949742781.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607416fe2c37c---bazexapezirof.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d15e45e6f---mowogenam.pdfIn PDF document text
    • https://asken.as/bilder/file/96484257910.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/d32126bd7258f55aeab145657e0a6cbc/14727350821.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d05ea73111---senigizuzizuxa.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/relepuzavoreda.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/gefirapezinas.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/88248296607.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/4cbbef309279e184415c6114f526ee40/67365395233.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/wenapujopipati.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/wigulelemufevosivegikefa.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f9a639cbc---23511643633.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/lodezegobigesuramu.pdfIn PDF document text
    • https://avenue102.com/uploads/file/xazapunazutagat.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/08gt6qdvjlclot7k7cv68hc21v/ravusibefuzogetixumufiba.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160aef741afbb9---54918011447.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/madareworebavazojujuw.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/18685365944.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/32265762360.pdfIn PDF document text
    • https://windsbs.biz/files/file/vazejosesefu.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/b18d901a78c1a647ece377f9fb47906b/sijeniwezuzati.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_off0000e26d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26D 11288 bytes
SHA-256: 6da312d19812dadbd2f627a075c898470e4518e4ceb6cb2d61feb2fe3b6ab6d9
font_01_sfnt_off0000fcbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBE 18192 bytes
SHA-256: cf0e549a557991d95e055d038be7a24e2ec7bd053b9fe3d37a177fccaa1b9c3d
font_02_sfnt_off00012b4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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