Malicious PDF — malware analysis report

Static analysis result for SHA-256 13f22d2cebf2059f…

MALICIOUS

PDF

74.3 KB Created: 2021-09-15 22:16:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2a4764175cbec8cb023000d8f71ae694 SHA-1: ea270987a8e9eadc444d54fffa5e274cf5e66676 SHA-256: 13f22d2cebf2059fc26536cad8a410dff065d5f6caee7523d2f195549e302298
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of external URIs and link farms points towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://nesthomes.in/userfiles/file/xitakuvumit.pdf In PDF document text
    • http://zuche0551.com/upload/file/77029812241.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/rurifavewes.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423f9669992---jizuge.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e87f0db926---93137777837.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/50619731953.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/97340212331.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/jalemozexodoko.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/rebapamagusowudivusifo.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/13620088145.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/wesol.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/55605047540.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/57156190183.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/20183124117.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/89045022536.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/bufopijedesetado.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/93584904056.pdfIn PDF document text
    • https://istanajp.com/contents/files/57186584344.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4ab620d35---69435365344.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/luzivukenegitijugaw.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/202191621261648.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/posebib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=gta+v+mobile+latest+apk+homePDF link annotation
    • https://rt9.rspo.org/ckfinder/userfiles/files/pikabijevug.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_off0000bccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCCD 10652 bytes
SHA-256: f071111cd0db13c620f65e73d22a2714a197acbd2fbf637038755705d110115c
font_01_sfnt_off0000d505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD505 17520 bytes
SHA-256: 2d2f941a474f60ec8b20025712f8007854b2a90b74f709c8df8d09cc43197f55
font_02_sfnt_off00010319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10319 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1