Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbe075cdce08a878…

MALICIOUS

PDF

81.4 KB Created: 2021-09-24 02:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 38e734a441e74081f2d34404a94f50e2 SHA-1: c2b828db164d28458a8ef4c29b6b5f9d961fedd0 SHA-256: fbe075cdce08a878331e9cd58beec54a784472b0ff4f77a6873965b99953207e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://paletydozahrady.cz/ckfinder/userfiles/files/xukij.pdf In PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/mumuv.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/95b5b7c9893fba2930448312a2f52a88/xovuvenaretuno.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/razasafupowe.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/91772288378.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109012027395685.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/sugaramodivozanejumuvagi.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/vukifolajuxa.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/96374629803.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/40116093172.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/senigozipuzizepokifod.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf10b1a378---gukarisajeloketud.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134d87026ccc---98135580002.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161348a7e300a0---91195149302.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b74b7c6877---welofetesotewikikosi.pdfIn PDF document text
    • https://onlinendttraining.com/files/bekovoxadef.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210909_18B42F271EBC6896.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/13617385310.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/80434906909.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/zureniwanibi.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/solakimigovukute.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/dedajifizagafenomefibosoz.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/43007479511.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=pte+reading+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_off0000d9f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F2 18344 bytes
SHA-256: 4345c5d134d53b4ed0122ddedbd01f54febe26b9fa821d9f2ebdf2eb55cf516d
font_01_sfnt_off0001094f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12166 10340 bytes
SHA-256: 6a9678d4b506433268192565da22100af4fe5196ab6b8e6ffdbdd1cd3354d9e8