Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e74095d311d54a6…

MALICIOUS

PDF

75.2 KB Created: 2021-06-27 10:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bb0794ffabd4c875c54b6f6d7cbefdb4 SHA-1: 5e37f26851235134fd29c91fb252ab6f4d947176 SHA-256: 6e74095d311d54a6f382441659fb50d45b79bb5bdbeaacf175ab38f6e5bca030
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/2kiagf93fccqsi9b3845o8di10/zumuxapulelufej.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca5345a190---32687617336.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/otvvdcq8eht3apfu82adkl247o/zipezaw.pdf
    • https://poolpoint.be/uploads/file/figemozusupamax.pdf
    • https://kodcomputers.ro/2664/uploads/rawusorurufoguxemiket.pdf
    • http://dmscsmartlifeblog.com/userfiles/files/gexufuvuvotejomijidapit.pdf
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/riropevifaxadedazudum.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079dbcc1cac2---nefijositifiban.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec0f229e9e---tewun.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/uuddvpcqor57b7gf0nlpti7s93/mafafewepujak.pdf
    • http://inwallendorf.de/userfiles/file/22941207869.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0f4815196---86966031916.pdf
    • http://0-50.ru/userfiles/file/serulomij.pdf
    • https://progin.swiss/ckfinder/userfiles/files/76085262551.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160927a446bbc0---98993828790.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/5lkog3etqv0nl67cj9oavhp6b1/venudetevutorobok.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b2353a0c238---98076800176.pdf
    • https://isabellepieman.com/userfiles/file/zulujosagimofakagaj.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078a35f7a591---57594278602.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a00507cfef---lanurexovewemajevug.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ae7703a71---denamoxigakajitiwilulije.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=sortly+for+home
    • 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_off0000c1c8.bin
dfdfafecfa3627c615fc46828416e9f92b3a1e3c2772325bed830dfe4e16f87d
pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C8 10144 bytes
font_01_sfnt_off0000d888.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD888 16792 bytes
font_02_sfnt_off0000f09a.bin
d7236063ece4fbfd3185cb187eae4e46c06baa65093f97d59cced88722bd9743
pdf-font-stream PDF embedded font (sfnt) at offset 0xF09A 17708 bytes