Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d4099286df08ca8…

MALICIOUS

PDF

84.9 KB Created: 2021-09-11 22:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 77918f6f3f96c4cff044c252f0733bba SHA-1: 2561560828f7ab74725e1bc80b0c48337182e678 SHA-256: 1d4099286df08ca82a66c41b68dda3b879343ea63d61bf24fdd5e4d168b75f5d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, suggesting it functions as a link farm. The primary URL, 'https://coretry.ru/uplcv?utm_term=touch+vpn+free+unlimited+vpn+proxy+%26+wifi+privacy+download', is likely used to redirect users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://coretry.ru/uplcv?utm_term=touch+vpn+free+unlimited+vpn+proxy+%26+wifi+privacy+download PDF link annotation
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcb0939921---dopegizasixove.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/rukarunebavov.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/128261760.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/64657127948.pdfIn PDF document text
    • http://mediacast.vn/ckeditor/upload/files/vajuronas.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210908/files/20210908115458.pdfIn PDF document text
    • http://sakulchaiplace.com/Uploads/file/20818372105.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613247336acf2---saganigizavi.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/robutuvix.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/venapuraburinewapev.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/1d626bae8463e06553ff52e14f3c4d4f/zuvuxa.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/c26fp5on0n91gkv03p4avjenie/92357561490.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/dezowekutagijuj.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/tukopaxemokiw.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/5874155910.pdfIn PDF document text
    • http://p-jtech.com/userData/board/file/morevojobefobulawidu.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/90748474251.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/nivuvegetakotepumelojinaw.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/87676992322.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/81604334364.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/vovumusogepogiganekimowej.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/16282245841.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_off0000e389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE389 10900 bytes
SHA-256: 0f00e8f91db091371123d260aaeb043cf71bab02c37a7125c29aa72e082e5c06
font_01_sfnt_off0000fc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A6 18920 bytes
SHA-256: 4904513591cf8583ee5e3993695a541ef737dd26974bef15ed761320c92ba471