Malicious PDF — malware analysis report

Static analysis result for SHA-256 52ae2360244fd80a…

MALICIOUS

PDF

115.5 KB Created: 2021-07-08 10:00:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 69ca8a8dda9a5bd94c8fe555ea770475 SHA-1: ffe0a2db570cb586922a970f7a7af12093d1e7d5 SHA-256: 52ae2360244fd80a57f09a8cb1756390bc39d25be4e8853c07c56ce713b9cc96
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. ClamAV detection and ML classification strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt, likely leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9899

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 http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c7bd0c0cc---5754404280.pdf In PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16079ca89a557b---badoxonejovojavirowe.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/jelunopewomotozadizas.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5db33672c---wegowur.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160964efd472ad---waxelugofodub.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/53427107085.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-6-19/20210619072426550041.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/3gdb9p6lr3bep3hvj8rn0q57p7/tuwurelixezepulufizix.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e0f8b003a---62360103105.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/a4ubl1i0tifsgk41sgm7omeikk/pasajugusujetejafupolopax.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160968f00be279---milopinelofekare.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///paxuzekeredimazonuj.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/femulinezuj.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16095becdcbba7---29613475701.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078a3b358cdb---62825549191.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210708_040942.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/xikafixaxiliwidedidib.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/wurosasepizizipubiduko.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bcdab4cab---jorefodagoluvokeviwaj.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079aa14d7775---6306336513.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/gagozasudironizujo.pdfIn PDF document text
    • http://petersonhigh.com/clients/33446/File/43544773398.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/97897853181.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=equation+of+tangent+and+normal+to+the+curvePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001477f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1477F 18900 bytes
SHA-256: 09c7e567c6e8241fb9e401f5947e97bed31ce19d07caf48d78d4ee7ac723089f
font_01_sfnt_off00017a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A0A 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
font_02_sfnt_off00018f40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F40 11052 bytes
SHA-256: 1f05aa74c055aa16ae05dcaea02761e4c6b7c94b9cded01cd4541817b172a417
font_03_sfnt_off0001a842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A842 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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