Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebb3318a72348f6d…

MALICIOUS

PDF

80.9 KB Created: 2021-09-14 06:48:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f8a199fb13d5e55f20a77bfdc5119268 SHA-1: a68dd9e58d946189a9997ea052781ed826f08abf SHA-256: ebb3318a72348f6d72f0fc300b6964d90107ef30935c08a286e591fefa3a3b7f
104 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to other PDF files hosted on various domains, many of which appear to be compromised CMS uploads or disposable hosting. The ML classifier strongly indicated maliciousness, and the presence of a 'download button' heuristic suggests a lure to click these links. While no scripts were extracted, the link farm structure and the ML verdict point towards a malicious intent, likely for SEO poisoning or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gestcargo.com/uploadfiles/file/galupuzopoludefa.pdf In PDF document text
    • https://ferropula.hr/files/femifitapupesupenivasowi.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/xupewozawinemoxeb.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/97a1a6e648eaea9675012cb5c673acd5/netururi.pdfIn PDF document text
    • https://granitnet.hu/editor_up/64174365167.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613d49e417ba8---94399636690.pdfIn PDF document text
    • http://mlead.net/images/e/file/99732574986.pdfIn PDF document text
    • http://emekyesiltepe.net/images_upload/files/30365639098.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/54316283783.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/69029920882.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/74467346583.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e06399f50b---rufijitarunasukuterebaja.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/42499321308.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/vetifonopurubejitanula.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/48786698458.pdfIn PDF document text
    • http://spreewaldpension-luebben.de/meineBilderAlbertGrundschule/file/lilepubezixu.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/95641360037.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/fozudisutusi.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/potozegofopuri.pdfIn PDF document text
    • http://babamoleskine.com/files/file/36075872680.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/35892138723.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0cb06bcb3---silozip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=apk+crazy+craftPDF 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_off0000d50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50C 10060 bytes
SHA-256: bf72832b2c66afa46eae653c009cc4d37268c3ca76cc593bea105ba3650e9394
font_01_sfnt_off0000ebb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C9 19164 bytes
SHA-256: d0c8868263a8805cae51bea1549b05454386ef88edfaf868c4fc44cd881336f7

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