Malicious PDF — malware analysis report

Static analysis result for SHA-256 301277624966dad6…

MALICIOUS

PDF

70.3 KB Created: 2021-09-12 17:43:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5cb3472b6648e53f55b4da07f3d922e2 SHA-1: db9cd0d5a09ef29802f59160f40068340caaef4f SHA-256: 301277624966dad6fed83035c523609250ff8edf6678c77aa2030dbfd92f4dfa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/8ef059bd5b20708852b9cd5bb373d08b/61721763835.pdf In PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/75458919072.pdfIn PDF document text
    • https://basisangka.com/contents/files/zetezasikagimoxojidelo.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/57883442393.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/powewib.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/lewonexalozunesag.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/sebetewuveguwaperawonosok.pdfIn PDF document text
    • http://huefpdf.org/upload/file/delalorugedupovi.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/75599596319.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/jogadesovawigetun.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/57042860810.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161391507df5dd---mowojavute.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/domimixibewivugad.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/pipufukufibususoxuki.pdfIn PDF document text
    • https://loyallcanada.net/editor_files/file/81132185645.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/kikivufejuban.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/bewojezobukagivewurivo.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/jevopuvolu.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9450cb231---jewezebox.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/ridelog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=connect+android+to+pc+wifi+directPDF 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_off0000b3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E2 10516 bytes
SHA-256: 416301bee6f4ab8121905350fe6012e4bcfdf2dcd858c324c4330ad06a1b774a
font_01_sfnt_off0000cc06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC06 15440 bytes
SHA-256: 1f803d3439ba85d18201b885704561ef813a4e74611601ac1aea3ee2c3b60830
font_02_sfnt_off0000f352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF352 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1