Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf20778f16ab69c7…

MALICIOUS

PDF

69.9 KB Created: 2021-09-26 19:58:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8429c2e567f3fbdad99591ee5edb7f63 SHA-1: 5dc17fff4af13793d2a6b2c222993c6278cfeb1f SHA-256: bf20778f16ab69c7e5bda2f6d93d4336194847e60ef64bd72e238f824cde6b40
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to lure users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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://scuolascifondocortinadolomiti.it/userfiles/files/nolataludetulevov.pdf In PDF document text
    • https://sklepbonus.pl/userfiles/file/minukolodivaba.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161438ca4d9af2---vunefuxefagomonuvotakug.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/tabis.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/86472919534.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/86333463439.pdfIn PDF document text
    • http://unityproductions.com/upload/files/xolerusexarogixesaradazur.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/78433450751.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/23848325061.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/67755714021.pdfIn PDF document text
    • https://ladida.asia/sporlegen/administrator/imagetempfile/96283347124.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b67e114bc1---40835501028.pdfIn PDF document text
    • https://bunianco.com/other_files/File/26302449858.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/4d62950785c8f71005647142b4c3ba41/43967784737.pdfIn PDF document text
    • https://farsiherbal.com/cache/fck_files/file/fefelevavisakiraboxovo.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/zigejutetetunazidisuge.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/bagokalosowinirubejitu.pdfIn PDF document text
    • http://michelschuurmans.nl/images/uploads/file/1816892922.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df0de1b082---gadevej.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1631890177_1.pdfIn PDF document text
    • http://www.forteks.com.br/admin/ckeditor/ckfinder/userfiles/Images/losafujusalibepi.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/povizodidagulovuxil.pdfIn PDF document text
    • http://champagne-ardenne.annuaire-regional.com/ckfinder/userfiles/files/vufanofe.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f315b951553d143442d499d36650518d/nanuxezokidotufinosifi.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/42054825320.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=pes+mobile+2021+apk+modPDF 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_off0000b211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB211 10776 bytes
SHA-256: 6e0488c42d4af4cfad0c679c62b411abfb466ab0c4be415fd5fbfc253d8b4ab1
font_01_sfnt_off0000caba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCABA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CC 15376 bytes
SHA-256: 785f2961e4bb955a2ebe789c835c22356abcb3b0c1090ef6105e4c9cca9dd877