Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cac7815302c53c4…

MALICIOUS

PDF

94.8 KB Created: 2021-07-02 09:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5173f26f09b689fb2bfdccea55bd9e2a SHA-1: 8cf7292a72be6e160c3e2e4a7ef7c6c2f78ac70a SHA-256: 7cac7815302c53c4814d13a90d96ac8670728aec08c166ae6228ea16d796f544
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to numerous other PDF files hosted on various domains, many of which appear to be compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farms suggests an attempt to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://agendatourvietnam.com/hinhanh/file/xilinoxej.pdf In PDF document text
    • http://ithaca1961.com/clients/875375/File/18920317078.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/xolujab.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/fifokopedunuk.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872c7a98f1e---86583707167.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/nirofaxotokupojaf.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/5b8fb5d6f1e237fdbfef748274fd6734/91371974533.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/pizuzeloxonoporotuvato.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/3271324259.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/xuzaj.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1609863cb2fad6---81752647999.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c62e965c128---tewunukefomaseriv.pdfIn PDF document text
    • http://didopack.com/files/9205230143.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/7a093deb7fe985783dd33f099a55d22d/10201596562.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/bqhblfd5idurbble5ash2cf85c/10986757283.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3582818be---zizafopexupino.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/nnjmp4caj7j0s3f9q8hjm03ivj/zajabozedolemugopif.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082839ab5f77---bazitisuxedalivuvoramu.pdfIn PDF document text
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/22973412460.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/66643052359.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc039a3d48---nefuwalekedigulizijag.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781af7c5135---fatoxipumojigoparemeliz.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608343b1ed136---68855224491.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/dd6sp4hpbamt3lu64mh6nft8qc/mibulilaged.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=the+conjuring+1971PDF link annotation
    • 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_off0000ffef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEF 10500 bytes
SHA-256: 4022dc6f9549137d7939dd3ff3ca9a5ad693332a904bd3e143d3c1e57950a884
font_01_sfnt_off000117d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE4 30584 bytes
SHA-256: d5ae48973ad01de6729c6bcf41079d1b50867c178055674c3feebe98e1bbeee9