Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd5c76014e029da7…

MALICIOUS

PDF

70.0 KB Created: 2021-09-24 19:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 1f36ec763b2412161476706a09253337 SHA-1: 4bd3cee5071b0e96675bd5e856f7bb30e2602459 SHA-256: cd5c76014e029da77692c0002ee5417bddf9231fafd9244b3473e17126bcacd1
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. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The presence of multiple unknown URLs suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://bocion.com/ckfinder/userfiles/files/sesujutataboda.pdf In PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/40264172435.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/nemorulevubaviki.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109241123396593.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/rijabuxati.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/15065295757.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145e485d2fd4---5438109518.pdfIn PDF document text
    • http://a-pro-peau.fr/userfiles/file/61210296604.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16134e7fd5e925---40611083432.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/1643089345.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412ccfd40eb---risutajuvimimobilomi.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/rurozoniwa.pdfIn PDF document text
    • https://seikai.jp/free_images/files/nunogugireleguzazarowufe.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/sefap.pdfIn PDF document text
    • https://sinarwaja.com/account/files/gijujefisamelu.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/mobitasunojofufusizinig.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/wesaz.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/loxapewuxal.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/34268310855.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/lavn46pgfrilvagteda0jlm83r/86573803724.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/67954277094.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/kedajinugut.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/kisijito.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=bus+simulator+2015+hackPDF 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_off0000b270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB270 15196 bytes
SHA-256: 64e87b9893ff2b6839404bc01a12a020d0e80fdc5e426b832590606e46be4ee2
font_01_sfnt_off0000d8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FB 10932 bytes
SHA-256: d1b972745de22f00b63231c22609713cd71f2fe3e54bccb2100e59f6c09690d7