Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0b5a0a71b521ff5…

MALICIOUS

PDF

89.5 KB Created: 2021-09-01 20:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 868d5483baf5174ca66465220fae1ad4 SHA-1: 38a1fc5d551ac2b3a50535104e7725d25152aceb SHA-256: a0b5a0a71b521ff55328d3b861ae8f32b08b9732d297fa6e2c05ac83a61a338a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to multiple compromised WordPress upload directories and other potentially disposable hosting. The embedded URLs suggest an attempt to lure users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kodcomputers.ro/2664/uploads/20804064820.pdf In PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/pasezazo.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf6840199c5---15733390045.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/gapifabilowibem.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/gudatajipudepa.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/59553812012.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/99255649480.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/pututavopusata.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/2689950844.pdfIn PDF document text
    • http://jycjqj.com/uploadfile/file///2021081223213179.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608630da1a719---delekutewasixagopuxoguxox.pdfIn PDF document text
    • http://peak-experience-japan.com/75245811524.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/41027784094.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/zenete.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084bc36b3891---daxesofuvun.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fed8bac953---77276448401.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160789349606b5---73501699038.pdfIn PDF document text
    • http://limitlessillusion.com/wp-content/plugins/super-forms/uploads/php/files/de88ef8c09dcc0f52b09495877ff9ce7/nuwijemodavedij.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940713b7844---45472373478.pdfIn PDF document text
    • http://gimhaejazz.com/fckeditor/userfiles/image/virisetedulira.pdfIn PDF document text
    • http://sparkpro.lv/content/file/lavapog.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/32478963254.pdfIn PDF document text
    • http://www.moyekolodin.com/files/67986788102.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ab15407d4---71582504586.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d850369c0---motunuxufetedadatobewefi.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/21812257234.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=shyko+amos+death+in+paradisePDF 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_off0000f772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF772 10892 bytes
SHA-256: 896884de95be813da97fd43ec27e00ce11f7684655246f73acb113fb894bb4e5
font_01_sfnt_off0001107d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001288f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1288F 18544 bytes
SHA-256: 5df0d0fc19282c31fc6b2d85a9a48bdda210d2f59eb971aec73165eb1022cb6f