Malicious PDF — malware analysis report

Static analysis result for SHA-256 daa47614a30d5b5e…

MALICIOUS

PDF

93.7 KB Created: 2021-09-02 22:23:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 57cc5b806df4275d3463e8201cbbafa4 SHA-1: fd2cec45d5a2fd41d5f926439a8b9053d17febbe SHA-256: daa47614a30d5b5eb0c1da74a08bbbebea6cfc3d352ee76df70f90b9356870f2
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various domains, many of which are hosted on compromised WordPress sites or appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and URL patterns are consistent with a link farm used to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://dichvutheapec.com/upload/FCK/file/1706420814.pdf In PDF document text
    • http://digemnd.com/UserFiles/file/daganomixeru.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/s1lreukkk47thjjm4nor6lk302/fopujusenejawijazesaj.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/98802561069.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160afad0001f80---lijumulafunifufumuv.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a24f3cb1d56---78945924225.pdfIn PDF document text
    • https://blv.by/upload/editor/files/sifugo.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b7517c4baa---xovunorezipawipafape.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/64782271308.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdcae4c72a3---jokejegaromejufud.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/75698053905.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/delawipebenapuja.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/zurapojuparafifunotome.pdfIn PDF document text
    • http://merwepizza.com/upload/file/pewozixum.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a02d53d11ee---kurizonuzovi.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16091c7d368c83---vazugif.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/38404126838.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/47056997805.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/4d8645a57b4ceb372effd2b5ee0e225f/kibuz.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092d027bba16---dikisajowetenin.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/wepukuboxi.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/34526134661.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/88107614762.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/91420c3da6237e17d1c211ed4ba46c43/warufuvufepaguxojipe.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e329b994610---fevadisa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=surveying+pdf+total+stationPDF 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_off000106e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF2 18524 bytes
SHA-256: ce46aae6630f8fa47ad23fa1855481589cec08647d3c12ac82163ae995ff0443
font_02_sfnt_off00014f6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F6F 11028 bytes
SHA-256: 594be6d97170256289167b5ebf2830bcdcbc38d602a7e49c1ca4b8faef5c2877

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