Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d073e6a6a59e81f…

MALICIOUS

PDF

86.0 KB Created: 2021-09-06 02:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d1cea847d5a5452937b97362c3b9e529 SHA-1: 236156d66273b008075159e067734a7786ff676e SHA-256: 9d073e6a6a59e81f423d2759ddfcf8f73aeaf58879344f3332b8538f4f41dca8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristic firings indicating malicious intent, including links to algorithmically generated URLs and a link farm on compromised WordPress uploads. The ClamAV detection and ML classifier strongly suggest this is a phishing or trojan delivery mechanism. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/tawotofozinoxe.pdf
    • https://komunalno-vrgorac.hr/files/19320710604.pdf
    • http://ghalemdi.com/userfiles/file/gijadudineruwim.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee58fde77c---38953922440.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16098a6bff291f---46727545144.pdf
    • https://radekslodkiewicz.pl/files/file/49451984609.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bcc05e73e---76030234079.pdf
    • http://scandirent-new.ru/uploads/assets/file/kodopigigububonuxuw.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f821405e4---fuzopimusagelave.pdf
    • http://ptairsupply.com/userfiles/file/puzunepanewawolob.pdf
    • http://www.tramag.pl/upload/file/nutejizuwo.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c2d9f3e77---serosofavunupuj.pdf
    • https://samavetah.com/ckfinder/userfiles/files/41096938928.pdf
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/utmmkke2nbltusimsgo0r8jvqj/jivigidu.pdf
    • http://limobebe.com/userfiles/files/debiteregofomonuv.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/i9slfbfllo0vojspp0vvsnrva2/bumakuxadobipusakanawijes.pdf
    • http://leebyunghun.kr/new/upload/board/files/tevofewo.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/1aq7vn20efbah18sjhqifq3mp1/vonalumixaduli.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d95cded65---subogizenanuw.pdf
    • http://rafaelokazakov.com/file/59074244288.pdf
    • https://abofahed.com/userfiles/file/murizodasikuxe.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adef3f8ab7f---82643462422.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=temario+oposiciones+tecnico+de+hacienda+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_off0000e955.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE955 16792 bytes
font_01_sfnt_off00010167.bin
b762e2114fd3842676e6e7b1144db78a00f939e94081a4d3b24c770065ed66f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x10167 18904 bytes
font_02_sfnt_off00013208.bin
2238c3fb9354ebb0919551a6d76d48e632a988d6ff6bb7b22923a1fa772ca9ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x13208 10800 bytes