Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7f49401d077abdf…

MALICIOUS

PDF

95.1 KB Created: 2021-07-22 09:22:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c110b8b8428a576d54aa9dec202e1fc6 SHA-1: 38553f59d659d50ade3df6c31340377e462902e5 SHA-256: a7f49401d077abdf7a7f386e55ff29601b4dbd935b484548524749e0263c8483
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload storage, suggesting an attempt to lure users to malicious sites. The presence of multiple links on disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/c73a5bb8f619cb23821a4c046f4c05fb/nozukivakuwidivebubave.pdf In PDF document text
    • http://mgocsm.in/userfiles/file/30613996229.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607e752ef0e1d---didebunupazuxu.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/16145350873.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/84113675049.pdfIn PDF document text
    • http://officia.tn/file/jilolodijizipokivetizenu.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/lotaraxa.pdfIn PDF document text
    • http://anjilh.com/uploadfile/file///2021051806521858.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071bbc6ba77d---zapebomijugivuzikomaku.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719e685fd18---97822819363.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/jasudomujokazubudites.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8976d3f97d---zadunin.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/10054537329.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/7843bd2574ec9187c53c423eda875187/70321507680.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/62265497694.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/27845470717.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/wumumuresilajofokowali.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/d3ihu3mhhstkihvrk7s9bcro5u/molegaju.pdfIn PDF document text
    • http://okulsanmalatya.com/imgup/file/mipujegili.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/70348868014.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/sotologomiwivax.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/wimesodasebimitozagak.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078533ddb613---62648919288.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d59e96f11d---29107825031.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/c8262e4f045beb04b317c4f373ec8aec/kusadodo.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c239c9c3770---venopuwosevusenisemurud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=cohesive+devices+exercises+pdfPDF 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_off00011086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11086 17284 bytes
SHA-256: db63ccabbabe183c008c63c09067877dc7a6a1d887f29205f5cc50282995a2a4
font_01_sfnt_off00013dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD8 10504 bytes
SHA-256: d0fe41e1f2f84b71849865cf0ccdc06a0b7edce4ff1b004d2414d9a2d5a599e0
font_02_sfnt_off000155ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1