Malicious PDF — malware analysis report

Static analysis result for SHA-256 efde000e402b0986…

MALICIOUS

PDF

77.0 KB Created: 2021-06-28 15:22:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1253a564d2ec935097b35abae4fd0247 SHA-1: c81c0d8fc9adc86ead2a4374a20a12f4cd7ef8b7 SHA-256: efde000e402b09860c91fa7339edf5c541a20a1eaceba8280bbd0a2417914aeb
156 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 WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, so the primary attack vector appears to be user interaction with the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://cructi.ru/uplcv?utm_term=morning+star+geography+class+9+solutions
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160843733e350f---junujofeku.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084bda7e245e---todurukabakunur.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/uv4k8prs6iup7mnk6j9s6c6bqt/xovob.pdf
    • http://vivo-mebel.ru/upload/file/83456756311.pdf
    • http://fitviewer.biz/files/file/bufivefitadamakalomej.pdf
    • http://broadgatecapital.com/userfiles/file/damedizumorinedubizugok.pdf
    • https://alexandrapanayotou.com/web/images/static/file/kubuk.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/118c3071ea8c662caeee47f7c7762fa4/nogepozeninalowubobo.pdf
    • https://bselink.com/userfiles/file/wozobefarifusetej.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89d7765b51---44217267617.pdf
    • http://sity-luxe.ru/userfiles/file/dumoralakijedonuk.pdf
    • http://teplospectr.ru/images/files/vozolopelibilefatajad.pdf
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/cd0530d82e259ae0a14e0cc1305ad256/41429582858.pdf
    • https://store-connector.com/_upload_bilder/_filemanager/file/wuderavemoxibapivegirutu.pdf
    • http://amirafouad.com/uploaded_files/file/sesakimanajasuv.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b601670252---fulefajoliwifete.pdf
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/f5a1186ed61076c60ebf1412972da92b/ratowudaburigime.pdf
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/sibagukimobatebufosadiw.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7aa036af2---86045366495.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160adbab32bb6e---19775180981.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9de3f2e5f---memajates.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160783aa59fd70---84885115971.pdf
    • https://alshaabcoop.com/userfiles/file/51377720960.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609413214e4db---tobunopovuvikupekubejef.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/c522f466a70cac1efb2233cecbcd9111/zerogekawupamaxafoxuwarod.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c72b.bin
e3109d5631cf98bd3fd50014f0ebaf91eb16bf22fe347f4c6d6fdcf695123228		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC72B 11028 bytes
font_01_sfnt_off0000e0d8.bin
4ab58ac361c2e7eb57376147065eec7bb2be5c7b8240f0bec1b6698e4ff7a601		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D8 16768 bytes
font_02_sfnt_off00010ca8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA8 16792 bytes

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