Malicious PDF — malware analysis report

Static analysis result for SHA-256 328eac026b74668d…

MALICIOUS

PDF

84.7 KB Created: 2021-09-09 08:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 23ac83f4104793a24f72f148381011b1 SHA-1: c19c4edd09822fd6a745d8053a978b2cd94066c7 SHA-256: 328eac026b74668d161658852b98f7e4272f7d72997ebc5bdf73555269d36390
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the document's structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=castle+crush+mod PDF link annotation
    • http://diennuocdanang.com/uploads/image/files/70582218429.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/41142373304.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/vokopodexixavedax.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/55823464828.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/rulekerizot.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/41641861820.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/wubadakirufe.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395ce61900f---fefuzebegike.pdfIn PDF document text
    • https://vhcvietnam.vn/ckeditor/images/files/kuzegewisewe.pdfIn PDF document text
    • https://cecprint.com/images/file/movolixokudijo.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/setezawuluvigatak.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/7172218626.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/59489577076.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/1182984002.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/76890532034.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/37315288907.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16132fe9eb8f97---97819625783.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161393f4cebc33---niwud.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/44014787847.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161396c57423ee---juzaxevisirimewofuxubolux.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/vobeneji.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/95471324219.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/nexofuwofizi.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/40ed3a66e782a23fdf5c88f4d09132bb/61620431151.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/ravifisuzoxeli.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/15261233273.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_off0000e97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97C 16800 bytes
SHA-256: 2d91a777133ec530877947b1daa0558ec25218c1d77610b7d82e9e0a9964a443
font_01_sfnt_off0001150d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1150D 10568 bytes
SHA-256: 02fbd8aad36767ab0c55663671eb356422a5ab75e610bd289bee90c8db638c56
font_02_sfnt_off00012d37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1