Malicious PDF — malware analysis report

Static analysis result for SHA-256 a38de3d1eb6288eb…

MALICIOUS

PDF

74.8 KB Created: 2021-09-18 13:42:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3553e9461b10352d86895188986e5938 SHA-1: 0f0f97928859240604327af16fdb754bf0922918 SHA-256: a38de3d1eb6288eb9a8837141d21208627e8369a2ea082d04b73bbc87fb2562b
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a link farm with numerous URLs pointing to compromised CMS uploads, suggesting an attempt to lure users to malicious content. The document body is unreadable, but the heuristics and URLs strongly indicate a phishing or redirection attack.

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 http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16145010d03f65---63953551041.pdf In PDF document text
    • http://ghefootmassage.com/fckeditor_userfiles/file/91002296234.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/18444576476.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/pafuk.pdfIn PDF document text
    • http://parfumland.sk/upl/febujafetimera.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/72512231011.pdfIn PDF document text
    • http://achwvs.love-mrt.com/upload/files/20382665254.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/sovawowolow.pdfIn PDF document text
    • http://geasit.it/userfiles/files/divinadisotasevo.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/21123186944.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/4072275117.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/79793031761.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/nutokabo.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/folelapokivavodisibapiza.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/50404876568.pdfIn PDF document text
    • https://mantyobras.com/userfiles/file/49763618692.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/30496367345.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16138ed85b50af---velegufoxafugekiwuxoz.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/15993343016.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210916091639.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613e183523c12---zanirefurovukagun.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/wojapurixuwimawivi.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/motenofetexirituxufi.pdfIn PDF document text
    • http://tatooazh.ru/files/files/mixupisabo.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/mipajajen.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/62166154856.pdfIn PDF document text
    • http://steinbach.casawell.tw/userfiles/file/20655689883.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/maxekuluroguguwunovuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=avatar+apk+obbPDF 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_off0000c1d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D7 9980 bytes
SHA-256: 972ab0335c5fb924af4a756061d61b318453b76e64731abfb12db4cdff7da38e
font_01_sfnt_off0000d7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E4 17780 bytes
SHA-256: f24e26e38577de10f86ce8143993d5124dff3701ad07a211d04518cb744405a8
font_02_sfnt_off000105e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1