Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ec349f464694495…

MALICIOUS

PDF

93.1 KB Created: 2021-08-02 10:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ec3407096bc417b68449d376724c5f37 SHA-1: 39cdda5020dbffba88abbc1bbdff269f9366793b SHA-256: 0ec349f4646944957163cbbec72e16939fcc4b8c9fa90571bfc6bd679b7463f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to various compromised websites and disposable hosting domains. The embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://garglob.ru/uplcv?utm_term=descargar+bluestacks+4+para+ubuntu PDF link annotation
    • http://jtour.vn/userfiles/file/molutaguvazemunipemuwipa.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/daa04049654fb4ebc0e2f2beeaf577d0/25808900304.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/98278494093.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606c800cd4e41---29939524492.pdfIn PDF document text
    • https://polnische-zaune.de/userfiles/file/30022946784.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/bd0646b08a102cb89ad9fd2a93b9caa4/24448707501.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/nuxusiresimewu.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080edb8d7cf0---40878813361.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/fetexunewovonuwisarus.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/jerugomusapajumati.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/21161a24a178c4f5c9b9a09b5f85333d/19454901749.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/deduzusavuzog.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/36787687181.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/84aba74c68555d41a21d297b99fbb0fa/poxonigazum.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/bf295e1b690f442293b6e453fb8a806c/gafajuvakebu.pdfIn PDF document text
    • http://viajesalaos.com/webroot/img/files/pulofufizalokewikojewuwoj.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/ef6022bc2092ff7fe68584d0195c11e1/67336964945.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/wanalotuwajaduxovasipagar.pdfIn PDF document text
    • https://wagaskar.com/media/vugefogigafir.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/pobigigem.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/66971386365.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/xibubudeputomix.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/57869787066.pdfIn PDF document text
    • http://lukinserv.hu/file/wafudubir.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_off000105d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011de2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE2 18296 bytes
SHA-256: 8fb4212e073d5af29cbcf6e5e72e58f1cffb6ba4151ae80f28cb027f0e551319
font_02_sfnt_off00014cba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CBA 10748 bytes
SHA-256: e28ca9a8d1736db40155073eddef1d6e989a920c2ed2d1f479bc719be28f7ba1

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