Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b1997c52744211e…

MALICIOUS

PDF

77.4 KB Created: 2021-06-28 02:28:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f7e16185c4448fba47b62c3b8e50f567 SHA-1: 48b7a68367767aeaca801c7af2d3c8a4e8f9a7a7 SHA-256: 8b1997c52744211ecb6f19cd80181af5513440ed4defeca2be110bb909edbd88
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/e14a91d2cfb5173d9f847aeaf97fac1a/87812531203.pdf In PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/d83acee741cf5b52fe7927f90917bbf9/turefupafisik.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/xenopagadozironibabadowuk.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/30816595541.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/18b02vfovi45ninhdjdtkom621/savademawexikugabajizamup.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80e1e1a430---dalupabunaxiwekokilij.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/37468286767.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/d27541ee98ff4556c7491ffad21b2b26/noximoropaxi.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093fd15d015e---10426099641.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be5f9ad0698---11445298422.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/74216504481.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/a83bvki8rtd5knf69vnpff3tf8/sosuwowemobivexakoli.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/28319285560.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/bawujamotutujuwelabunun.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/pabejog.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/e25bfa883f152e267ebece18a92818b2/70249320254.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/55186357283.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a328ba6de07---99150871200.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160853154e0be6---58311177222.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/remut.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/f7f4247389e11a26ce4bf7ccc180549a/52305054057.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6533d9122---59457089584.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/p7h3hath96gljnc99njl7kinc2/71215753143.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06e1b048c2---xivarukavijudemoligaz.pdfIn PDF document text
    • http://cpils.com/userfiles/file/23493810324.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/korepevo.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/jejixisopujulo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=watch+hangover+2+movie+online+freePDF 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_off0000cb67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB67 10796 bytes
SHA-256: bec7d32b5094b414965b547d8ff6aaee280eccf773f46c46fb12f51cdeb0dc04
font_01_sfnt_off0000e42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42C 16844 bytes
SHA-256: f7dcbe808d625542423753883be175e768f9088da3ddc1e19402ad91fcdd4f6c
font_02_sfnt_off00010fce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1