Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cb87161d82a8bca…

MALICIOUS

PDF

91.5 KB Created: 2021-09-19 16:19:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a4dd370ef0279ae87a25b9f9ce7cb3b5 SHA-1: 649b0e29c0c15b3add7470ddf57a308067f27666 SHA-256: 5cb87161d82a8bcac8ebc7eadf66c3e38613dee5cf723b69fd1d147bf7cc7511
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

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://huntic.ru/uplcv?utm_term=sleeping+murders+by+agatha+christie+pdf PDF link annotation
    • http://kalmi.ru/upfiles/files/77156238950.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/mumevelavizotuxi.pdfIn PDF document text
    • http://soc-in.com/data/media/files/bupedimilisege.pdfIn PDF document text
    • http://grupophi.es/uploads/files/13369774244.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/83489243096.pdfIn PDF document text
    • https://salonrewards.ca/images/file/86094480670.pdfIn PDF document text
    • http://ergakiland.ru/files/files/joxexuriwezigavoton.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/22311137029.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/tebimipudatuvosol.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/rasegivetekiwixabomifop.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/46754857358.pdfIn PDF document text
    • https://nycsmindia.org/ckfinder/userfiles/files/jizis.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/52543240208.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/tefusasasatuwi.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210906010638_3o1ke8.pdfIn PDF document text
    • http://vodova51-53.cz/files/9893046505.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/5hee2c7cb6dr4n816c37vceos2/zuxikijutixoreparoxebixi.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/ragibuvizasozinud.pdfIn PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/sedumis.pdfIn PDF document text
    • http://change4best.ru/upload/file/mexute.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/viruguwafeziz.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/naluwevasitasovomi.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/0b83b67f8783795b5587d79f352d4a02/gixojifiduvisuwoxoruxat.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16143f037d718b---32710169526.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/47108661348.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/4568479442.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_off0000fcef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEF 18556 bytes
SHA-256: 0dff851a77bd4a1dfa0af714d38bfaac3e48263cc13d9951bbf6ba97d46897ab
font_01_sfnt_off00012daa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000145c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145C1 11376 bytes
SHA-256: cef01d083148b341e2ff04249faaf420b13e241c4e2a9c3fc7e28f8232f77db9