Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b658c9939c01057…

MALICIOUS

PDF

103.1 KB Created: 2021-06-29 15:12:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7d7eba060f50943b6425089501243481 SHA-1: d3652a783d3e2b1fd0895904915e0cb1c44e871d SHA-256: 7b658c9939c01057e983ba9c84ff73fa29f2129b805c724105c732b2c5eb53f6
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The presence of these links indicates an attempt to lure users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://chcial.ru/uplcv?utm_term=mean+of+frank PDF link annotation
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aee2a4b0c0c---80269166382.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078f2b254120---17530740260.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad48912765e---mewobemifevoti.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2bf8bfc22---jifomirujiwofekunipo.pdfIn PDF document text
    • https://menu2uplus.com/images/file/madukunugopizogus.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4385902898---kobasokarikigikakekawezo.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/5er1e8nvln8mpbe24eq75rb5km/kejavuvolike.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/92370372760.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d43d4340ae---vatogapirobiwilosimenepi.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/fnvep3m6ns3c14hnqs44nre8jm/duromerebalupewemiwa.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/sigeto.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/56692b1e4076531b30c893cca0cead4c/bopanuvemezejadelusux.pdfIn PDF document text
    • http://learningkey.org/userfiles/niparedejonatapati.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c8b93f336---54666703501.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/5b8537e92795d81bd4b600d116a363aa/68514391141.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/e956f456197195fce497311660d8284c/wefazazufajazegukozuso.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160a522a852fca---mimugigafose.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/5162791020.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/vasedipesituvipumo.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/7noajmca78d852dcaj0l43u3q2/59805555280.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/29d65c4a91cb94b86e124a2d527ff482/gapanituseziwi.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160863b9a70cf9---bikigitepalori.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/28193978717.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00010ab6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10AB6 23044 bytes
SHA-256: a19c3b865b38127c91f8c71b1a5485859e835c7aab903853ecd27bbec738cd2d
font_01_sfnt_off0001332f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1332F 17408 bytes
SHA-256: 14944fc5dbd91c366e47b4e60086de98290c4686ffb0fa1e39edd84cee7305fd
font_02_sfnt_off000160ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00017902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17902 9888 bytes
SHA-256: ed3724a0f673c3bb403b5c2361293685f471f7d8e26d5952ef783172ec059752

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