Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6ae560d1287470c…

MALICIOUS

PDF

93.1 KB Created: 2021-09-02 21:04:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6911df715985634e968ca9104e505cc4 SHA-1: d4553d0a8e0c05e4bb8ef7629511e3269d91c48b SHA-256: b6ae560d1287470c079e474e2849daf5b16de6da816275bd65a6ca5291b597d5
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple external URIs and link farm heuristics confirms the file's purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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 https://garglob.ru/uplcv?utm_term=esc+guidelines+2018+pdf+download PDF link annotation
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/df06c8f0abf6d59515fcb3fcc04b6cb0/79705011071.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/014b363079177ce752b521e9f6459ab9/21431042092.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b06f7ddafb4---jowejezitezixuwupu.pdfIn PDF document text
    • http://www.sealjet.mn/pictures/files/30169125251.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee5a495974---rekajarijamexazupelof.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/selisipaba.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/35361905676.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af4a341a231---29235077218.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/kabidapak.pdfIn PDF document text
    • http://grandfiltr.com/files/file/64611705901.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/natopivovabarakuf.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/90750464909.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/40425326932.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1b5a256f0---nafowexopedulebapunad.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/56884244079.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/fd85c94bc1ce8d5670d180eae3d126cf/pumuzapikuxoxedati.pdfIn PDF document text
    • http://bienbao.net/uploads/files/lejemefosopapofupikaxin.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/kodosomafujigotuzewoxexa.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/77d88b1bdd8844b654b74a934fea2577/85704098491.pdfIn PDF document text
    • http://www.agot.pl/upload/file/24152715544.pdfIn PDF document text
    • https://mytopics.it/uploads/file/77555951799.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/58595756199.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/tukiveliremimizatikajewu.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/medipopadukususut.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/72247757218.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/a141efcb257b3e5d812156e079435244/rasede.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/tuweberika.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_off000102b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B8 18876 bytes
SHA-256: 61674d8bff50def5b573d9d231a0c3839b40f22209a39fa2b0444abfa8793d62
font_01_sfnt_off000133d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014beb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BEB 11268 bytes
SHA-256: 8ec948cc7b8ccd7f1522b90532b58760c1cee91b8dbdcbf036aa1b113bb11005

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