Malicious PDF — malware analysis report

Static analysis result for SHA-256 f06b84dd6ac396d1…

MALICIOUS

PDF

93.2 KB Created: 2021-08-13 02:18:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: fa8dd64313b9e67d6b88fde23415e4e0 SHA-1: 1d749d3db8873a3aaa484ee47f91ebf358935139 SHA-256: f06b84dd6ac396d1f3379844b5bc0943ced92d5b131684304d40370709b3ee5f
96 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to manipulate search engine results or distribute malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://juhaszautovill.hu/userfiles/file/74621279266.pdf In PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/76689447102.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cee999e0914---motop.pdfIn PDF document text
    • http://garystrike.com/clients/3/30/301ae0ed988f9237e4cb8f8c41f6cb36/File/80949767644.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/6ed2e37631f4a2cd3a31a14a9b5136b3/mulimelodanufet.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7d9d9d4998---sedowajaxomobazewezobap.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/15819081684.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/3946433664.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/uf1o0e33amnvol4bpd8537poto/25351630201.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160bc44abc68b1---lepowofugamirap.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/wologowol.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/tegipabuwibitulesegal.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/vawisivevegadinezevova.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/dsd51fkcpoq2qaee3ekma12aj5/lusowadusuluzofakurof.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/pozevuzanuzug.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16091e4c51737f---25725369245.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/9513338645.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160c2dac28a4c1---80607114464.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/8gl0j3kj47u2nkjk2vj3v4vjtt/65161347264.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/nodavujojudaxufowuposepa.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/43645636903.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/f891408631bd9e3649a815839c87bc27/vidigirev.pdfIn PDF document text
    • http://labcoop-jsc.com/wp-content/plugins/super-forms/uploads/php/files/d743vd0bogl532asssi270p8ii/nugeriwok.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/pabodixokitanalelazim.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a41b651bd78---21530358503.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/raluwasuwonigugifi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=como+fazer+prensa+manual+para+tijolo+ecol%C3%B3gicoPDF link annotation
    • https://lapdonline.org/file/muzowozivuroniranef.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_off0000fc6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001147d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147D 21928 bytes
SHA-256: 9a098ac6a2cc52f22b9aeed1156cad48b01e0ae4228a575a2333366093b4493d
font_02_sfnt_off00014a5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A5A 11280 bytes
SHA-256: 9c984ac7c01685e4a90e11173d0c77496d77dd129ad7db1650daf667fe07bb4e

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