Malicious PDF — malware analysis report

Static analysis result for SHA-256 57a8427e66a3f4a4…

MALICIOUS

PDF

148.6 KB Created: 2021-07-04 06:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 736da3ff66f5af66bc3fa8935c0f9e2a SHA-1: 92f256a8d9e60d790fca0e1b814b7a02c1d8a65b SHA-256: 57a8427e66a3f4a4ccc1016cd15d60961d284c84417915b7ccf8790be17fbdc7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious payloads or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/acsarpbjil8ku4upnt8e5c0do1/rerotiku.pdf In PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3d5e5d207---72351944357.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/12042163502.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/99967073698.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/segejebosutavosuvi.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/0ee46ba2dbae5a373976de1cc323af09/zuxinigododunalopesibebo.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/f7ef6abe969da182834a4c924a0a2486/5809997074.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ddca12e84---biroxif.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/kevabanoxopabasazukex.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b035947256d---55101273949.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16082542d3ce61---kizoziji.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/28f4f39245f700f6c4525b8c4ae9ada1/1269551020.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/20269842784.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47df4484eb---fufolisadikaxa.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160716be92fcf7---kitigasurituditowefiz.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/73dbbe85cb9efd536cb46bb83c20b196/mekozezotaxim.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b843eed14f2---jinerixogotipaziletowinak.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/ed1614f69c37e3bff6ea490fe48883fe/82883612197.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/lipixofigato.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/nelotoni.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/12709861840.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab650535459---72325974971.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/subunedomovovafotubowexu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=laboratory+guide+for+the+analysis+of+ayurveda+and+siddha+formulations+pdfPDF 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_off0001db2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DB2F 22224 bytes
SHA-256: 3e35cf8a21c7c0c89a9ac0ced2316e8af4651b215558c1e1c74342eefd736476
font_01_sfnt_off000211bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x211BF 11324 bytes
SHA-256: 1fde5b2fc5c3bde54292484efda355417fc36dd756ee79fa192ef4492c885ad6
font_02_sfnt_off00022bd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22BD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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