Malicious PDF — malware analysis report

Static analysis result for SHA-256 31a1ddae36fa8d7a…

MALICIOUS

PDF

115.4 KB Created: 2021-08-22 05:06:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7733e4bebf47bc358e6b55f3f385e5e9 SHA-1: 8bfe28a8a82b198580f6a27444a53c6105526a74 SHA-256: 31a1ddae36fa8d7adabfe6452ed1b098de58ab29b5be1b545ba5cc945a60e611
64 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable domains, indicating a link farm or redirection scheme. The heuristic firings suggest the document is designed to leverage these links, potentially for SEO spam or to distribute malicious content. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2552

Heuristics 4

  • 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
  • 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://chcial.ru/uplcv?utm_term=when+christianity+started+in+kerala
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a79ccad6128---nabodoxakure.pdf
    • http://win-sonic.com/ck_imgs/files/xopewoji.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/d6f1e4ced2a75d848c405b3c3112aa58/13805445654.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f532ee7a54d---59637860187.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/3t46bfj68aq02qbdfo10c2bm06/61730774202.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1498585f75---57035971434.pdf
    • http://c-amc.com/upload/files/23424213883.pdf
    • http://morgancountyoh.com/userimages/11458705552.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/b59678483c9d80b51335666f916be79a/96200773257.pdf
    • https://clumba-indoor.ru/files/files/19626344738.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a31387a8442---57438159586.pdf
    • http://softtox.com/new/userfiles/file/33965414736.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1611a4215298ff---saxoxefobamodode.pdf
    • http://medicapoland.pl/uploaded/file/tiwedulamobetit.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8e6bc08be---latalabanamebudegazapal.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607211cebc18e---gapabowe.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/c0f0880967d31775f4e0aa17efbb2b53/71010381490.pdf
    • https://aquarell.ro/userfiles/file/topirejudes.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097f9b3c39b7---42289343162.pdf
    • http://jjinline.org/file_upload/file/10817199165.pdf
    • http://busankid.com/webfiles/board/file///70138618033.pdf
    • http://winterwonderlandzundert.nl/uploadimages/files/konivepuzivuf.pdf
    • http://ticketsperiodico.com/galeria/files/46378760776.pdf
    • http://appartenvue.net/appart/upload/images/pigovarufumog.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017f48.bin
a1907d8d981df00aea8355dc9429d77e27046bd5342a3796ac0de3ca2cde2609		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17F48 17384 bytes
font_01_sfnt_off0001ac60.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC60 16792 bytes

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