Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc8a1e30a20404b9…

MALICIOUS

PDF

95.7 KB Created: 2021-09-19 15:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b0f342ea7c4e802c1c6b4072da6854fb SHA-1: 66420acc24af9d72a882fd4666eda79bc6f81107 SHA-256: bc8a1e30a20404b92f32ef045c662a994332a60816a55fb2609465f8343c39a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content. ClamAV and ML classifiers strongly indicate malicious intent, specifically phishing or trojan delivery. The presence of multiple PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics reinforces the finding that this document is part of a distribution network.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://turbooto.vn/upload/files/88369070947.pdf In PDF document text
    • http://lemma-studio.pl/userfiles/file/pegolut.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/zosawafilukobil.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161369e3d2346e---terufoxosali.pdfIn PDF document text
    • http://khocabien.com/uploads/files/vebosadezezubazolawakoj.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/27723264693.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/wofajavapunoliwi.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/57833603454.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/nabodudagunokuxogu.pdfIn PDF document text
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/pewudo.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/64875656397.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142bafc75b41---gerer.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kurefuvabobir.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/kirifep.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/xesumusir.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/nuzowomukadibuz.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/xapelumoputemaset.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/b8a18bb03e9b4bb3e620dd6112f51df5/31722978456.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/bb97d6f9c8a8eec2a4f0079c0bb2bd27/6485093583.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/doxavopunafona.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/zewulugam.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/161431b6057961---97095621429.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/161447ddfa8c20---8410373083.pdfIn PDF document text
    • https://martabaktelor.com/contents/files/16022243794.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=bloom+into+you+episode+1PDF 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_off00010525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10525 23044 bytes
SHA-256: caeabdb5afbe717dfaaa5209ed6caae9f5d3082bbfc8d1f20c008db50e8fdbc8
font_01_sfnt_off000140f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15907 10612 bytes
SHA-256: 44cc382af1d37007644ec351686167172c1039d094f63a4277001ca367e0a81f

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