Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dda14fbd41b3894…

MALICIOUS

PDF

89.9 KB Created: 2021-10-13 10:07:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f160688a2f3d2647bc30656d17c2087b SHA-1: f5e88f6a3e10ab90ba70e9881b039f3bda388a0e SHA-256: 7dda14fbd41b38941b854274e789de879c4e4102beeef859bc944550e4b53c08
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=contract+act+2056 PDF link annotation
    • http://metabolit.ru/files/file/zogaberovojamusoka.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/gomun.pdfIn PDF document text
    • http://showdoimovel.com/files/files/19373507971.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/kejofisasepujuzumozes.pdfIn PDF document text
    • https://ecpa.fr/uploaded/file/86803601536.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1615da9932f5d5---34783776246.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/wiguvum.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/16744957316.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20211006040603.pdfIn PDF document text
    • http://soupworld.de/upload/file/tojubeludaditiwijamizom.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/4d9f8f7699c7d7b3bf084ad7eec3c56f/2438050756.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/demirev.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1615d608a4902c---69189810594.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/64914335004.pdfIn PDF document text
    • http://tdbm.vn/upload/files/67380636856.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151ddac08f72---82788815774.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161661ef52c957---xoniro.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/vugusevemixixapumurir.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/temabegefizafurimupap.pdfIn PDF document text
    • https://subhagataguesthouse.com/userfiles/file/memomaxedulifojulagiwum.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/4a3f9eb62be02ea2dc9ad3ce6ef63cb2/liwararisavuwe.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021090115550635.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/xuvemefitidojewe.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/kusudubumaloja.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161543e841a562---zipavepavanotus.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1615c9f8838713---vikuvonutupip.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/94957198108.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_off0000f76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76C 19812 bytes
SHA-256: 1cd809e2835fcd5c7d33dbea7aa10c315587c6a253bb8b3fa5b7969965c02c44
font_01_sfnt_off000129f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F3 10360 bytes
SHA-256: b26b7c6e32f26f19b31cb775f142b1d4dd55927070bf74896ff6a7d90dcd3f2e
font_02_sfnt_off0001419c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1419C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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