Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c216a8b740bb5a7…

MALICIOUS

PDF

81.4 KB Created: 2021-09-04 22:24:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 020b20e57df5241e869cdcbe60b392ed SHA-1: 3d88ab626b5f021973b5d3d2cb6f995289817e2b SHA-256: 3c216a8b740bb5a76ad3c7f065c9200390cf4442c3d23062efa379228a46b7c8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to other PDF files hosted on compromised WordPress sites, indicating a link farm designed to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, and heuristics identified it as a link farm on disposable hosting. The primary attack pattern involves directing users to potentially malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4da322836---pafasefo.pdf In PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/7efdd78ea6e016947a7ca5acd1fa736f/dadojakivowekonekorope.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16078482ad4ce7---ruzopexutuzuwuneg.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/zasuzixipixekeguluzuf.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/400423979.pdfIn PDF document text
    • http://au-zlato.sk/upload/files/98813768087.pdfIn PDF document text
    • http://mcelvain2020reunion.com/clients/b/b5/b5167212b805812c9439186484f80f5e/File/tifojugut.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b2b679e5a725d03640d29f6902a0dbff/tejifikutijipobugoned.pdfIn PDF document text
    • https://rajatotogroup2.com/contents//files/rasezinidavobedaxobezarum.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e7a2d245ba8c35ecc740735892088214/tejaputanezagebowasaz.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/2cbb3fdb5a2a43bdf6f5bdf61f6ce8fa/jivigekilitujelo.pdfIn PDF document text
    • https://ocw.tw/uploads/files/27641603634.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/toxutoxosapomumazelapu.pdfIn PDF document text
    • https://citytrafik.nu/images/file/60320076300.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/8i0ajk1epkaq83pfv419boi701/8850268231.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/lozeg.pdfIn PDF document text
    • http://instandee.com/Images_upload/files/21763460301.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/dofowewuvedona.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/61726415054.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/3c120769784b8c19bd46b58d9a9cb548/36050578959.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbfa67b173---nitodarisi.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/nenodirunopat.pdfIn PDF document text
    • http://snkpost.com/fckedit_file/file///20210831_0_56_46.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/2bff95bfea306f9c754b9c4e73a53077/31949513125.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89144621489.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=orgulho+e+preconceito+livro+pdf+gratisPDF 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_off0000d3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDC 19952 bytes
SHA-256: 0a9cec9deb0164dfcd0cecc2d6a09ba7d73284cfe68584635969bbeb8bb0dd2b
font_02_sfnt_off00011dda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDA 11092 bytes
SHA-256: 78c7feec5fd930df9d02452b34b01193948502ae3b8bf4226634e93e34784c2f

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