Malicious PDF — malware analysis report

Static analysis result for SHA-256 bacd9daae8ba30fd…

MALICIOUS

PDF

71.2 KB Created: 2021-09-25 07:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: da2af193d689b110d3f38937ba645f79 SHA-1: f9633832057a37d26a796de0d0741f52077a27e1 SHA-256: bacd9daae8ba30fd8536927aa877885f62a347618d9175dc4be404b4ce512768
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these links for SEO manipulation or to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://drafthe.ru/uplcv?utm_term=tubidy+music+mp4+audio PDF link annotation
    • http://materialdeestudo.top/userfiles/files/tonawodazezezadovul.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/vevurojimevukap.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/def884bf31cfb3cd0ddf61d0a1cae6ad/92473013821.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/82335167618.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/97728846597.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210910145402.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/72349682919.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614e46ebb5b27---65356838597.pdfIn PDF document text
    • https://akvanova.ru/sites/default/files/77072831350.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/74017697306.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/23133662903.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/neworemitiretozukojuwa.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/pokuzigivikibunazaguk.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/23739575684.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/womewadovobuz.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/jetufavi.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161413a378ead5---zigovefovefowabowa.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/runasevapoze.pdfIn PDF document text
    • http://thietkewebsite.btccorp.vn/uploads/files/73430189135.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/72508474210.pdfIn PDF document text
    • https://mcsfood.com/images/file/9162531624.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/kinilizaluwaluki.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161336651a647e---mexuzi.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/velavinudi.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/lubiwemulutikajefofojig.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/xufemunareri.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/57933378342.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_off0000b66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB66B 10588 bytes
SHA-256: 1084a65f1cc56c4fbe3e92b93372a4166281adc4c8ac01e36a500bfebfe64ea7
font_01_sfnt_off0000ce73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE73 15932 bytes
SHA-256: 399ccb0115f71ede7cf98e83beb201bb97955b83b19ae7d3e8ed9f011b70b194
font_02_sfnt_off0000f6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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