Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbf12b4e0d77bc78…

MALICIOUS

PDF

81.2 KB Created: 2021-09-16 07:01:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: da7c3cd6b74966e9735de9c0ad6f09af SHA-1: cdcbe2883b80eaa29cf3656de511d74affdb6ec3 SHA-256: dbf12b4e0d77bc78da7ea882638319c029e2450d6d53cf0087d3b8066155603c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://archism.ru/uplcv?utm_term=match+triple+3d+mod+apk PDF link annotation
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e1a5e5c02---71062279978.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/67406932626.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/84503187772.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/45299030068.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/mawimawojuriduxevamamuxo.pdfIn PDF document text
    • https://lomasdelaweb.com/userfiles/2008.09/file/36240482494.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210904060742.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16141688eedc6f---juxosepeza.pdfIn PDF document text
    • http://skinct.com/upload_file/file/Fl202109031212484174.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/ginonomitosolenusuxoku.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/25776147963.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/20901429078.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139cd4b9a54d---56633393429.pdfIn PDF document text
    • http://madang.eu/f_pds/fck/file/97548160301.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/79465295103.pdfIn PDF document text
    • http://ggbris.com/slbdavbatala/userfiles/file/73895906166.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131cf63d2124---nezodabazibojejup.pdfIn PDF document text
    • https://huanghecables.com/d/files/wagazavozugovutowiboze.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea645bf05d---mejoxexok.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/81640156271.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/weferimidetumazogokutexar.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/65925695994.pdfIn PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/kokuzamakubigimafapi.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_off0000d3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B1 19432 bytes
SHA-256: 240fbe28996005d988c15294fcf1c94eb5690985efa140998c0ad28062392a53
font_01_sfnt_off000106d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D9 10764 bytes
SHA-256: 2a85e5813f44eb74ec496580d7f94bd5f2aad924b56e9682773df81e77a5571f
font_02_sfnt_off00011fa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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