Malicious PDF — malware analysis report

Static analysis result for SHA-256 214ca69c10102a3e…

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 02:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fbed185549a70b997d1e115a97164eba SHA-1: a359828164debb483fb9fee37caa5479d4e4f282 SHA-256: 214ca69c10102a3e55a782b11bfe2c68d0bda6b0edd8a6afd771a81b4e3800a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URIs and links to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is used as a lure, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://medvor.ru/uplcv?utm_term=it+comes+at+night+watch+online PDF link annotation
    • http://vanillasky-ch.com/images/files/67105916011.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/11566479916.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/72489320611.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/zoxigefojezumipojib.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/2df5b2b38a1ad70b04d93093322f91d0/66904829978.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/bifekokaletikika.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/budawekozapin.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/videdufejex.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/ravevidedobofa.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/34429533439.pdfIn PDF document text
    • http://p-jtech.com/userData/board/file/lipewukugabusoxi.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319ae76d690---detapozutubutuvifabozufax.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/vivimoruketometepezufi.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/43965074688.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4bfdc3517---73946524221.pdfIn PDF document text
    • http://www.hkimm.hk/_bin/ckfinder/userfiles/files/koxavokagi.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/jupazevajunepe.pdfIn PDF document text
    • https://aurorabersinar2.com/contents/files/29064751392.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/tevafisozotajosakus.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/gisadetet.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/reropovagemimusu.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/zigasuwobadi.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/xegebisudedokorale.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/dijabiwanowiw.pdfIn PDF document text
    • http://cserepakcio.hu/xdata/file/pobotix.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/romuxi.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/buxuwawiwusalugekenazu.pdfIn PDF document text
    • 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_off0000da3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3B 10616 bytes
SHA-256: e9aec814c9991fec25b00520ef14df25658a7bef716dbfd7cfc0125a19767e55
font_01_sfnt_off0000f266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF266 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A78 17384 bytes
SHA-256: 460931cc344dfd180099a65fc57e8cf78056d364cfbbc6517a2d7f314fb70e4b

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