Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9962f71be9f0687…

MALICIOUS

PDF

86.4 KB Created: 2021-07-02 07:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9e7ee365f222ab4bd5d55f99879f1a40 SHA-1: 3a3758747395aae14b218b340fbd50e7f9fa467c SHA-256: b9962f71be9f06879d5fbfcd2b098cc31bdb1d24cdc020d1c9be3c075bf04a0d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to numerous compromised WordPress sites, indicating a phishing or redirection attempt. The ML classifier strongly flagged this PDF as malicious, and the heuristic firings confirm its nature as a link farm hosted on disposable or compromised infrastructure. While no scripts were explicitly extracted, the nature of the links suggests potential for further malicious activity or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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://cjandjunemillerfarm.com/clients/75830/File/99408397980.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/3856b9ad7762bc25016feff9fc7c2e92/74231445386.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a47c793c612---kivosar.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d82a4b5ad78---70417699985.pdf
    • https://charterfori.ir/basefile/charterforiir/files/30698223433.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/fa7886766e97fb33bc91b155a67be6b8/vebora.pdf
    • http://liyangah.com/Upload/file/dogazuxoxodefakikugugavu.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2ed5b9c7a---46506605468.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/oa15ie0n46re08nionk19ad077/jikemisugidomebabetutup.pdf
    • http://aptchasers.com/FCKeditor/userfiles/file/salobonixuxodonodofara.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5b91d19e8---36949691054.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d257e5d8a9---wuzawofimuw.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/ee4lirt6a04mi19mn1tc1dn2o5/xazeruza.pdf
    • https://brod-plovdiv.com/images/46465469392.pdf
    • http://hotelbellevuepalermo.com/userfiles/files/melenudifejawamotazakas.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30416cdead---nimokis.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/ef25bf9b53ec2ad4e1dbbe8785ebbea0/lotivego.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608397dc19bbf---33787912202.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f54a166251---radepavujesepotowo.pdf
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/jiniwigezed.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b378d185d6---fagape.pdf
    • http://dogable.de/userfiles/file/4322205978.pdf
    • http://aplus.to/userfiles/file/visoze.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608059331df9c---nipadunulefefe.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eff22269d1---suleraxijitabisinul.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=typescript+cast+any+to+number
    • 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_off0000ee66.bin
20b249f1733da5502ad4f6f8e74cd0abeedf0c10312682cc91df2733bd62bf15
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE66 17256 bytes
font_01_sfnt_off00011bad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAD 16792 bytes
font_02_sfnt_off000133c4.bin
f085983ab1324f7a84f62b3f56739052578b42ac3c21e581a97daa4180f6e179
pdf-font-stream PDF embedded font (sfnt) at offset 0x133C4 10804 bytes