Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f5360a0fcdfa383…

MALICIOUS

PDF

73.9 KB Created: 2021-09-06 23:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ea4c30bb04d93fc1f89d2da1f78ef142 SHA-1: 14847643b31125c991d9b754c42df26b5aadf274 SHA-256: 0f5360a0fcdfa3835729c7655d527ecb48a3d375a6befada0543852b6971842e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised WordPress installations or disposable domains. This suggests the document is primarily functioning as a link farm, likely for SEO manipulation or to redirect users to malicious sites. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://laborke.ru/uplcv?utm_term=control+systems+nagoor+kani+textbook+free+pdf+download PDF link annotation
    • http://mertlakustika.cz/images/pages/file/54967458707.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/87938132834.pdfIn PDF document text
    • https://daismene.it/file/zodidexuzilixutipejov.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/57344a6a21c79d70c978ae3d28eeaed1/2765938832.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/9qn0ltn9n1n2tvru1dau3djhtu/85061008632.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612beb89028a7---pejigasufobulaguwef.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608328fa54e55---poxovij.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/botiba.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/muxasotuwivifeguwakazax.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/kumewupedinujetuse.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/70404228532.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/h81vkk546t7psk752ufcvh4t9o/38117843249.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/6551291537.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/kuxulupu.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/75477580990.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/8d4dcb1cbdd9933b3013c07766006f24/fodevulatudigereb.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/wenarofilutekepajutun.pdfIn PDF document text
    • http://phillipsbrothersmill.com/clients/6/65/65192871cce8a6e36080a9ebd2808b02/File/42268381601.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f99a8f517---11653169017.pdfIn PDF document text
    • http://ontsgoi.shop/uploads/files/jokunadelurezepabebere.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f361cbeb222---makokofovakufaxor.pdfIn PDF document text
    • http://kanstm.com/ckupload/files/63061637630.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/h28g831tonvtnjfn9okqc351d6/58753214456.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/vvggavmr6eqov4q981m77bp574/97075943850.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/1e7cd638c518827e2b72c7733aa9293d/refigarax.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_off0000be23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE23 11408 bytes
SHA-256: b9002165f9d36179a0f4a8c6c6b3c31ddc735393498d421de027908cffee6b15
font_01_sfnt_off0000d8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D4 15452 bytes
SHA-256: d490e4cef35efe2eb08d2a3124a3776172a666b784d2fbf1f030f645b5c4be8c

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