Malicious PDF — malware analysis report

Static analysis result for SHA-256 28bd6acb0230d691…

MALICIOUS

PDF

86.0 KB Created: 2021-09-17 13:27:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 066fc3ec7482b0155c99894c0a2e2632 SHA-1: 6a8bb7eacd05928627bf938883a106287c97b508 SHA-256: 28bd6acb0230d69125d4e75decc3064661d8710a4116f3efbf23d3aa01417ae6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the presence of a link farm and the overall structure point towards a common phishing or malware delivery technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://livewireeventz.com/userfiles/file/27091394996.pdf In PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/zafuwepedipaku.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/minitoroxemotubujerabaj.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e95948e43f---87427494597.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/66885434147.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/10232797091.pdfIn PDF document text
    • http://ahknchem.com/upload/files/6004860447.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/mujijupokagapapo.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/mejodeno.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1613115cc0db09---palufe.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/fesepavobugadedemefax.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/livulutu.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/14522096727.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/34115537731.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/kudanalaxadifij.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc6aa5101e---58442252773.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/makukumijotupav.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/pokeja.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/74282082137.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/rsglu7v5q59o6rubp5g1f3bca1/51241538010.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/polaxatem.pdfIn PDF document text
    • http://dallard.fr/ressource/site-image/files/foxaditodotuvaludofe.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc554f10bb---dagimokopotales.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=things+to+build+in+minecraft+pePDF 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_off0000ebdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F2 11268 bytes
SHA-256: d2d0fc85d83d4b0cde84db27d3285f69bfb2d03b26ea658914de5857dfea4ebc
font_02_sfnt_off00011dbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBB 17408 bytes
SHA-256: 988344b31a4fceab7a9d0bee0df96d4cf7fee24db72ce660be6a714de357555c

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