Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7bfeb628be594c1…

MALICIOUS

PDF

80.0 KB Created: 2021-09-16 16:47:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 62c1b2c6e2c77bf7afdd9cc9e836dc0e SHA-1: 9d8f67b3c81ea8ad21638483b8d0b4b0ad5d30ee SHA-256: c7bfeb628be594c1bcc26528d5bd3f536e08a6da985b2d10dffc76e226cf7136
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised CMS uploads and disposable hosting sites, consistent with credential phishing or malware distribution. The presence of MFA lure heuristics further suggests an attempt to harvest session tokens or bypass multi-factor authentication.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://oniceh.ru/uplcv?utm_term=how+to+get+uc+for+free PDF link annotation
    • http://papinchess.ru/userfiles/file/ligot.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/60668806904.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/tagudoxibeziri.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/54106416321.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/sakegidajuworamopoguxid.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/vakodapojixezixotiv.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46262445765.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/70304072279.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/62797660216.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/wizomisubigovosunu.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210906224821.pdfIn PDF document text
    • http://khachsandomino.com/hinhanh_fckeditor/file/61711015994.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c349ef704---kivuwegemikujubevo.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/lowabekuso.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/negeforurafupasiwomifoful.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/0508034232aed40817dd410b1ebdfd7d/7177241569.pdfIn PDF document text
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/22463977.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/bimaxopuvelikunaw.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b9ee234ae---febogofowofikuli.pdfIn PDF document text
    • http://rrarental.org/upload/file/tefemejon.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_off0000d42f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42F 18276 bytes
SHA-256: 8d61fc766ebaa38273000a2f6f0d1d0a59e54babf4663fbbe28c7f3655d9bbf9
font_01_sfnt_off000103b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B6 10116 bytes
SHA-256: 08a3aaea135c17958bcd81ed1e39076b703e9a6df071210bc9cd5f12c265b128
font_02_sfnt_off00011a7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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