Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d7f9a4fdfce5b7f…

MALICIOUS

PDF

90.3 KB Created: 2021-09-17 22:05:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 53324660249a6e0f9a4f035b94d6f919 SHA-1: 72b796126dfa2550ae4b1910cfa0c9940cc68e66 SHA-256: 6d7f9a4fdfce5b7f435b0ab265b1fff1ddb91a8e8087a3cef6f39802c84191f0
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs, while some are marked benign, are part of a larger pattern of redirection, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://knx-shop.ru/admin/ckfinder/userfiles/files/97390590848.pdf In PDF document text
    • https://siriusdynamics.com/assets/uploads/files/jadawofepulufuzobuw.pdfIn PDF document text
    • http://quaisetoiles.fr/img_pages/file/59221549335.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/20851882260.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-6/20210906070859443420.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/5930171621.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/vefixovedimujonotom.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/44651899103.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210907095651.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/4699035411.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/24177576565.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/dotimeva.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/geparupojavubab.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/rewad.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613500aca5760---bizozupajarolazevezeve.pdfIn PDF document text
    • https://partnermind.cz/images/files/4015014086.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed92c3b297---levawoviz.pdfIn PDF document text
    • http://rapet.hu/files/70806352451.pdfIn PDF document text
    • http://harlit.com/upfiles/file/pojivuges.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/17046198726130b549c36cc.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/nixibikefafokalawekojopo.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/tizife.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161429d506afa3---2208079652.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=the+new+rabbit+moviePDF 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_off0000ffa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000117ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BA 17228 bytes
SHA-256: a6a359e310e3701c2c12dd7e3aeca02c49a876fa49f4c9b253a8b6d249ebe18d
font_02_sfnt_off0001446a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1446A 10412 bytes
SHA-256: 7756131a114cc9e2bd0aa12116ab978857ccf86fba66e1ecdbd50d3a2cd24605