Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f3d8019c47f4440…

MALICIOUS

PDF

85.4 KB Created: 2021-08-17 02:16:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 619320e251bbb643a5d7fc0753852cc7 SHA-1: a8a42487a3ba1c2f1d025f1b9cd4da1aae37d3e6 SHA-256: 1f3d8019c47f444003d5808576c1d32149e7c478d4a36eee839e2102d655a92c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to host malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and the 'link farm' heuristics point towards an attempt to trick users into downloading further malicious content, possibly disguised as entertainment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071380dbb389---dudotaxowon.pdf In PDF document text
    • http://hud101.vn/webroot/img/posts/files/zekadutox.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160d5afaf3801a---goxibujit.pdfIn PDF document text
    • http://huntland.hu/upload/file/75153561889.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/782cbbfd48de6e5e0428c31c9dde8fe2/zizazipi.pdfIn PDF document text
    • http://e-hane.com/files/6327209409.pdfIn PDF document text
    • http://apcmagon.com/userfiles/48492245230.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/13845032554.pdfIn PDF document text
    • http://islandpointfl.com/userimages/95321831043.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ef8e5bf01---rilovesefopokofiv.pdfIn PDF document text
    • http://zuche0551.com/upload/file/zeragoz.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/2d4ceb4945c80b3178bbe24e6f60b68f/11061067175.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/99152452694.pdfIn PDF document text
    • https://rumusjitu.com/contents//files/zitatibubudetigeputup.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610af3dea907e---wofekase.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe40d8901a7---84322451445.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/foqnfhtfdp6g7vq01ag2a6q38o/besefixuzeremofotebodugus.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/r765ghd7am9f5qoknlnt0vb9hi/mejuxovuveduzolutu.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/sv28qi1elu6ei5f0cr8kbu6ku5/xivosowopod.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/muzafuri.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210701035130_ulfyzg.pdfIn PDF document text
    • http://griswoldremgmt.com/uploads/files/sujusoxi.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608440c36f670---45329965419.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/9604921355.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/79052119606.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a434d0259---dakatizokaribixorokem.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/11336042287.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=conjuring+2+full+movie+hd+free+downloadPDF 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_off0000ea9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B0 16848 bytes
SHA-256: efd1d48598df6488ee96c6fe59d64a01b9bd289b285dd2902d974ebfaac86b07
font_02_sfnt_off00012e9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E9A 11068 bytes
SHA-256: 9712c2c7d808abbd3a4f17af2f79a6f29813ebf287087a49fc5e6b3e845c1903

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