Malicious PDF — malware analysis report

Static analysis result for SHA-256 8178d1a5d02a878b…

MALICIOUS

PDF

98.3 KB Created: 2021-06-29 13:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7a563d63f3497e903ee078bb63d85dc0 SHA-1: f9d7cfbbf5cc3481c64490252b6d5c4a846ebca3 SHA-256: 8178d1a5d02a878b7905aa1196eef9c9f2be57803f601f3c5d27efab0c4b73ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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://medvor.ru/uplcv?utm_term=promotion+in+marketing PDF link annotation
    • http://adamlegal.com/userfiles/file/ruxokunugokubanegiguwi.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d79caace1---67376444466.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/63759613032.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/94462586086.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/0604ca216584bc3c47de2638bbb4506b/zipakenirusox.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/xewunobojemofiv.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/86853747061.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/06ba0023949cc22ed49c49b0fb66a1ac/81373287974.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877d1feb0ec---betetepabufegop.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/50202787815.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098e17431b64---sivimarizesas.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/vamegexinisevugugito.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/fitowekamukepusimumuv.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087f3186a924---puvukizidi.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c28fd924ca3---mabives.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/galifalidilewarajuraro.pdfIn PDF document text
    • http://skncn.com/u/files/18982692248.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc35fa8028---54455008418.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/63509569195.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/34d299be68e28a79319c844887e7a4c4/lagegawixubago.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc41f921f7---82667865067.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fbac0a6ef---zakibuzi.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/3b0cd9ffbde268fce6007dd366350495/wupupilurujigoneze.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2aa6d8f60---4698527375.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099cbf559789---japabomo.pdfIn PDF document text
    • http://silverleafspa.ca/clients/10619/File/30014064820.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_off00011dd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD4 18124 bytes
SHA-256: 564208835f683aea51e486fb7672234d625480bb93c465dfaf8f054116b9e011
font_01_sfnt_off00014cbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CBB 10328 bytes
SHA-256: 448f174954031de4157e32fba37ca916d821ce0649e3da0513ea5a174eb8e5d4
font_02_sfnt_off00016403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16403 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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