Malicious PDF — malware analysis report

Static analysis result for SHA-256 a56e864c476661a7…

MALICIOUS

PDF

69.5 KB Created: 2021-08-14 07:15:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8a39549ee75578355ddb00c03950a732 SHA-1: 6bcf9e7d42b93945b7a9e65517f1dadb1b8bb3de SHA-256: a56e864c476661a71e9d963223ce53c1f6bc264bcaa90f7f2eb7bbec99e094f5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF viewers or redirecting users to malicious sites. Multiple heuristics indicate the PDF is part of a link farm pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://garglob.ru/uplcv?utm_term=zula+full+indir+torrentle PDF link annotation
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/a467bd5afdaeb9ebee2ce98913cceee6/wisebi.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc38d503aa---5290591100.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/tenexagozawolugosem.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e586f5cf1e---fobimaz.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/fukoregoneramubofejazur.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/bijopegukoxanewoxam.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/0d329a1dde8a9d6b908cec6b6db35d3a/71139255453.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/66144362181.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/39d1dd04b7fc48165a4b3d6f259d27a4/12735258016.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/72286565160.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/qafsbgmi2v4j62ejch3ir47so8/2871101657.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/47842253575.pdfIn PDF document text
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/b8bc5372f8e24f4b0a13ca8765533b7f/lalekobilizov.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160716700dce89---kilojuwisu.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/1qr87s1b47jan3okr22gr4rfki/labegati.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160a7679d13926---91133493734.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608c516d4b490---98294440936.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/vumomoro.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/51751210469.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/c8g3q9aohq3hi13fo2tioajmu2/sopogakivipozuwolatap.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/58956729812.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161056fe786105---51846141696.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_off0000b581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB581 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD98 10244 bytes
SHA-256: 9933a541e1303cfc1c7e98db68d3af0f4954b7ce01cfefca47d8acfb83c72c9a
font_02_sfnt_off0000e4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B0 14396 bytes
SHA-256: cba6637df3ea26909962adf922d85478d4f40c4308496a3d55ea434106b8ae74

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