Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c72f450025808a3…

MALICIOUS

PDF

75.0 KB Created: 2021-09-10 08:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a77740c922229936213da968fc49d43a SHA-1: 9bf3274a8e3d9d9b4d7168708eb0ef8c2421f85f SHA-256: 3c72f450025808a3d4e2b6667b3ddbe9188ee754df3a2bc05dd27592a75d842f
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs pointing to other PDFs and external sites, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcd7872572---62460615392.pdf In PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/memivovelo.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/99498304755.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/mebavufoxoxonuxepabiv.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/09/file/202109041520326490.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/23513779626.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/gopibovufozi.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/menewimiz.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/faxijujosoliz.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/gipevewibumiwegoxibati.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/82964104618.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210905_093620.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/59722701360.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/fawulezubiwosinugi.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/66102501044.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/lijipadetafivareki.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/bovesibadudumi.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/12691896113.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/70986624348.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613005f572b93---dinekegegokixetu.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/92002288763.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/pamepotudodove.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/gumobowifalujijetawi.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/13233596296.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=tempo+video+editor+mod+apkPDF 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_off0000c379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC379 16788 bytes
SHA-256: 6bf312a722fe76f512d23ae1e98bd09ff8b61778e50aaa046d5c6798d7c4f0ce
font_01_sfnt_off0000eea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BC 10356 bytes
SHA-256: 3a4c2e246cc8033ae2d953c75b6ba2f372635593f14d7cb1b5ca6acdf6b20b2d

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