Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e2e8a77cab66f96…

MALICIOUS

PDF

82.8 KB Created: 2021-09-04 17:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 729fd2776975d77324c84e9ab87e679d SHA-1: e505ba2e85f85d5ecef16500a7eaaf126d89e566 SHA-256: 6e2e8a77cab66f96816b5877ee59542c17d11372c20e9208a5bd01db8f86c9e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm that redirects to multiple domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The primary attack pattern involves luring users through a seemingly innocuous document to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/nld9pnudt4ep2ljasb24oj4hv5/sisoxuxeworafewise.pdf In PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/fofex.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/5206727954.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607722d810cd8---regupi.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e169c2c8b2---widenolamag.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/mumefusitida.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/muwepemetubufere.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/puzolasamoxamoturiwi.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/58652545245.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/tedewepokagokobowisule.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210623_124439.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/4fdfef69d684f2936547a8b3264010ab/favoradajuwogute.pdfIn PDF document text
    • http://metall-press.ru/files/76647301818.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/gasenuzodopeko.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/ninedilufetalijov.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/29874681919.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/sejobuzisi.pdfIn PDF document text
    • https://tiemhoamo.com/data/dulieu/files/zereti.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/poteviwagugedororifaw.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160b20b2d3aa74---67116923589.pdfIn PDF document text
    • https://globaltranslation.com/demo/global_translation/beta/userfiles/files/55507957321.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a10dd41e5de---34618328358.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/61611332716.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/1213060074.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=lg+oled65b7a+manualPDF 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_off0000e0c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C2 10684 bytes
SHA-256: f39b0533939348ca100611f330e8247138ec52bdd5527643562454ade18b354a
font_01_sfnt_off0000f909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF909 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001111b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111B 17428 bytes
SHA-256: 90bf6ec7f75a7dd485cc2630140f998ba6f2e9b58786ea1d93b16e7621165089