Malicious PDF — malware analysis report

Static analysis result for SHA-256 35e6a346870b3fb8…

MALICIOUS

PDF

87.4 KB Created: 2021-09-01 01:03:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 38f229ed901a29b7abd0030971c5759c SHA-1: 070dc65db5f8eb9af068a7e3658e6398d15882f7 SHA-256: 35e6a346870b3fb8802b17a5f62b9555c6dd6bd3ecad4d2b1fb996f8149eafca
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c597d50b537---zudamax.pdf In PDF document text
    • http://thunderstar.cn/userfiles/file/20210510175038991992181.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607589068976f---15120677518.pdfIn PDF document text
    • http://wenxuezj.com/images/File/wositafigelasoke.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126115d0c872---liwitesimalozobefoxeporot.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/lg8h83hqo63bq8bhujbsogi1aq/xitivel.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097ada161f2d---7598934563.pdfIn PDF document text
    • http://famillespourstarlight.com/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/84231173061.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/5799ad991ed26344ffd460848c632e40/38452498230.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f78beccca---84182101319.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c38fc9640---86964808774.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/d4a20b98478938cfc61ba2aa7175648b/zifimoxizol.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f3cb3612b40a1b573ec6efb36956c3ad/naponadafedawikozatesare.pdfIn PDF document text
    • https://duvarkagidierzincan.com/userfiles/file/63538644678.pdfIn PDF document text
    • https://cubic.is/userfiles/file/6127116169.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/miwerikuwarinitemar.pdfIn PDF document text
    • http://maility.pl_adresuserfiles/file/64079001658.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608d85b332fb9---98500388037.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/gogapilekiwamip.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210826113818.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/fibugiparikibitewigir.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/49456887801.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=indian+idol+participants+2019PDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/xavogosekoru.pdfIn 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_off0000f7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CE 10788 bytes
SHA-256: 91089325314a06ada5b621b9e8cb1f7c53c2193af6b5c5c4f15a980da858e23a
font_01_sfnt_off000110ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CA 17804 bytes
SHA-256: 1a9e48de581911f6c798ce5a94584275158049a6bb32bb8f37e910670705206c
font_02_sfnt_off00013eb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1