Malicious PDF — malware analysis report

Static analysis result for SHA-256 9af717b290f690f5…

MALICIOUS

PDF

101.2 KB Created: 2021-08-20 15:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1919b384b3ee546b4f65d14178d29cfa SHA-1: c0b6f7dcadeaeb5ad69918e5808fb9b71c9af305 SHA-256: 9af717b290f690f5ff25c4e1f6f2c80c93b8b4bd5ad0c076a383ab8376a1abf4
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, containing numerous URLs pointing to compromised websites and potentially malicious files. The presence of multiple links on disposable hosting and compromised CMS uploads suggests an attempt to distribute malware or engage in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b37d135fc7---nugovarunopivowix.pdf
    • http://biomax.shop/filespath/files/20210819040936.pdf
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/40226164991.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/a28c1ad2d6487aa325ca2f52cd8d8c52/lovimafosifeporaxikenuwu.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/31dc6d6a7191d538f65580de78d3f298/nekajimunugovovipixubozax.pdf
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/97299197206.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2d04a857e---sudaz.pdf
    • http://zimaletto.com/uploads/file/laxapije.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16084e9e091256---61664134688.pdf
    • http://designpavelzapletal.cz/files/file/zesalok.pdf
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/c8jj3e9r3evgrhe8rbcabmeva1/kopofikotobivuduvogalek.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160852befbfa8a---fojupagoxorofisadagajuto.pdf
    • http://career-id.org/ckfinder/userfiles/files/93084017533.pdf
    • http://ccswcd.com/userfiles/file/soxesiri.pdf
    • http://playitdirect.ca/ckfinder/uploadfiles/files/pipipotax.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c21b875adf9---56065314499.pdf
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/59216480780.pdf
    • http://karpatskiles.ru/store/files/88765316238.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/bctvn6j90a38lebmmqk7pa7h84/51276709646.pdf
    • http://gistfamilyreunion.com/clients/8/8c/8cbf0a40baaab9dd4734ff2cdbb1e120/File/60876544675.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be0fcae6e52---wejuwowemas.pdf
    • https://curryleafharleysvillepa.com/hang/userfiles/files/budilezitifa.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070522a1fdc8---davejexanidunelaxikelar.pdf
    • http://jncs.kr/page_data/file/20210718070904.pdf
    • http://hasanmasat.com/ckfinder/userfiles/files/xikamifu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=introduction+to+statistical+quality+control+8th+edition+douglas+c.+montgomery+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_off0001254a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1254A 16792 bytes
font_01_sfnt_off00013d5c.bin
c13f18c380fc428fcc2d48a9ef4a927bdb55b592619add9f5400f482392ba86d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D5C 17604 bytes
font_02_sfnt_off00016b49.bin
df3eabb6324add65938e85e59a57e63957d7b0de2f77e2938d2beda3354448da
pdf-font-stream PDF embedded font (sfnt) at offset 0x16B49 11652 bytes