Malicious PDF — malware analysis report

Static analysis result for SHA-256 e61eb82d7145fdc1…

MALICIOUS

PDF

73.2 KB Created: 2021-09-16 21:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 964534ade50eb4431934577d21817d16 SHA-1: 4ff3e3acd5c46f56d5b40ff002896c3e3cca3dcc SHA-256: e61eb82d7145fdc166b2a590dd3ede7d88abf68ceaab98df6dc6da62ea93824c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating a phishing or malware distribution attempt. The document contains a link farm pointing to various domains, some of which are hosted on compromised CMS upload storage, suggesting an effort to obscure the final malicious destination. No scripts were extracted, and the document body was unreadable, but the presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the intent is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://olboihorgaszto.hu/editor_up2/71363271955.pdf In PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/kaperivatenepelojapite.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161384ba6aece7---furuselivi.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/kanuwajimekituxusiso.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/53230398736.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/41752656092.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613099588b341---fobalezarijupakumonotet.pdfIn PDF document text
    • http://ptsound.com/plugins/ckfinder/userfiles/files/33576519637.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161436436cc069---mebuvekavowisupiz.pdfIn PDF document text
    • http://reopen911.info/media/file/67427801544.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/gedalimazomufafokudo.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/o1dq72s5fhupf2kgou4rob8gtk/883936251.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/10392477756.pdfIn PDF document text
    • https://mobisteelegypt.net/userfiles/file/33639607145.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee73291b5a---2570476471.pdfIn PDF document text
    • http://technoprofile.ru/userfiles/file/nofiz.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/file/22630803701.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/93b94a46ea065f18a325a4ab3bd26061/16801684208.pdfIn PDF document text
    • http://gulfapex.com/uploads/file/40556650558.pdfIn PDF document text
    • http://pileki.com/imgup/file/fijizokus.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/jadawixuzus.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/tegabigiromaxumilimibuji.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021090307041837.pdfIn PDF document text
    • http://web5gstore.com/Files/files/wosirofaputogibupizidaxej.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/85920226228.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/14102646321.pdfIn PDF document text
    • http://gyuco.com/uploadfile/files/20210916_202144.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=perfect+posture+premium+apkPDF 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_off0000bb49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB49 16540 bytes
SHA-256: 25e9cdc7d2e68f6dcb6076ddb52843bf131a59302c5db1a4cb821539091fc486
font_01_sfnt_off0000e4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBF 10684 bytes
SHA-256: 5029413c0a867cc4f4c383545dd11c5ec3847bfeae5a86fe0fcafcc985308c09

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