Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d9c6e7f813e4982…

MALICIOUS

PDF

84.6 KB Created: 2021-09-02 20:36:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 14a2d2e1f60ecf558cb452e404b3e132 SHA-1: bf122b7f94fa2818cefb161b2f22d297b9146876 SHA-256: 4d9c6e7f813e498292bdaec8e66e8766096c9b5f43318a9ee364727bf64f24ad
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/b9d48340aa4d78cff8842a15aac6fe6c/kufika.pdf In PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/fanuxo.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/s85jq78p7ls9e4b55o1pbdt837/84921671147.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/67vnvct6h71144u9bej7q8sbo5/rezax.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/tizobedop.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/ledajiropig.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a07442d70ed---finug.pdfIn PDF document text
    • http://iworking.vn/uploads/files/90659948215.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e77a3f01f9f---mawuzadenolojawuvo.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/9d0cd80570e5fcd9209d6c3db1d27952/sodazaxaluwiril.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/pobumufunudexo.pdfIn PDF document text
    • https://fasleh.net/Files/files/52383880478.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/zumibutalesovazo.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/53247513924.pdfIn PDF document text
    • https://kimcert.org/E/file/rajowuniledazetevafaf.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/piradabax.pdfIn PDF document text
    • http://allasclub.com/campannas/file/sagiwuxoritasit.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/13879870178.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df1c097f7e---fuvomebenufamap.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/925ce48caad971b58f060686f45dba32/kofemavaz.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16205001530564.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/65493268939.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160863edb6d6e7---lomapedivadulod.pdfIn PDF document text
    • http://gloexdr.com/wp-content/plugins/super-forms/uploads/php/files/41f8d2f1e9d6e0d8db89be3d5488702e/62853992048.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16097caf270565---98073630249.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=dorian+gray+portrait+pdfPDF 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_off0000e7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E1 10444 bytes
SHA-256: 7fc7686d3360b633cbb226762d27d9c658ed49c7c44819ec3fb95705597e8fe7
font_01_sfnt_off0000ff78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001178a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178A 17520 bytes
SHA-256: c90af7061e0546050a0e4b235ddf7190e25f497fc88042e6a564909a73df8444