Malicious PDF — malware analysis report

Static analysis result for SHA-256 f09d7427431e7551…

MALICIOUS

PDF

83.2 KB Created: 2021-09-12 19:08:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4e8d4176068bbba24db165a2bcbdfab5 SHA-1: ec2878f38d01425a8aa7aaa71d7933c57aa923fa SHA-256: f09d7427431e7551d0c57495dc0d340633d26999dcc1d480f64b96084c40dee0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a phishing lure, potentially leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/161388f1f3ec82---motevepisasipisi.pdf In PDF document text
    • http://ecoaga.com/documentos/file/84270523584.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613611d624a58---jefabesejinijeg.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/95599861936.pdfIn PDF document text
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/noxozalademaxatotukafak.pdfIn PDF document text
    • https://strategieb2b.ca/userfiles/file/juzilironumumeperi.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/disepanamonugeg.pdfIn PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/pigexutas.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/25568973283.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/88412222659.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/fosoweriripodofivazeni.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/memolidapenufufefosi.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/tilejeduna.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161354fa408cd1---wamasasoto.pdfIn PDF document text
    • http://vucert.vn/uploads/files/gupavonovilazukez.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/41441562682.pdfIn PDF document text
    • https://plasy.com/uploads/file/30496598625.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/26953679867.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/fageguvupa.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/nigogurusif.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134177b8b037---86850468381.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=dream+league+2021+download+play+storePDF 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_off0000dd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD54 11236 bytes
SHA-256: 3c1ac6c3c2b64e782583f3418e713963b8095215afb343bbea8526e8b2f7f31a
font_01_sfnt_off0000f79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79F 18188 bytes
SHA-256: 44a8ed1c2e8cab9fa4e0cf14ef26d08603d942f51541af1265f30fae2af70ad2
font_02_sfnt_off000126e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1