Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae39e374e3eac058…

MALICIOUS

PDF

89.0 KB Created: 2021-07-27 13:29:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f40e7bd095638d916e04fe24f518d8d2 SHA-1: 56f927ae5b722711f46a144dcd5c4f4caf12fed8 SHA-256: ae39e374e3eac058224d9a503fe6978d6b7b6599bc4947a0889ea7d963e443fb
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier strongly indicated maliciousness, and the structure suggests it's designed to host or link to further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/jezadapuvetofagewufekupaz.pdf In PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/b69ec5c3ec36465f1c0e86190cf691fc/zajedukivutexavonuxizad.pdfIn PDF document text
    • http://bucketdiaries.com/uploads/files/36096275535.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/remagopagaj.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/1f13a560d27c304ba98cc27f39980af7/mudotufogiwarirotituf.pdfIn PDF document text
    • http://desagresbrts.com/clients/34568/File/duzapawuximika.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/molod.pdfIn PDF document text
    • http://bi-acaovo.com/upload/files/dududumefije.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a486660e87---dinolufitovevizo.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/7k2lvtflkm4bourj9mivpadqpi/1192754010.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/7aa7554043f134a3504765996053dbc1/fefemetezilelobamaximov.pdfIn PDF document text
    • http://dzbnf.com/upload/file///30200182788.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608de52c4f5d4---65434225734.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/gp5u8p5740k1dsgitlsih5h2c9/wegebekebawoxo.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160ba79d097ddb---nimoxogupetisebal.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/ktkpigv2ho7fgpt2tchf61bfd7/19106633315.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/41851074388.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/buxosifed.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/runumimozufatibekuluna.pdfIn PDF document text
    • http://ubest.ru/images/file/lawekaturevaxat.pdfIn PDF document text
    • https://belhasasecurity.com/userfiles/file/jugugeledijiwoboga.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/d3be2b0540a0deb23dff6ae705f69d80/varutalip.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3859b8b36---18816262705.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=photoshop+elements+2020+system+requirementsPDF 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_off0000f6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010efa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFA 17164 bytes
SHA-256: 250b39d58e6ac8db9a8f03ac276510f1a25801e728731274906ffeec85dab3a1
font_02_sfnt_off00013bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BDB 10956 bytes
SHA-256: 7971060c223ea11932eda3b62fa40d6b44ff3cd466ed998458cf16da073a1a68