Malicious PDF — malware analysis report

Static analysis result for SHA-256 e30dd571c8daba82…

MALICIOUS

PDF

71.4 KB Created: 2021-09-17 21:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6f99e52fb32f8fc79ae903278a9c8f6b SHA-1: 51108c41be6982af3d595f5c8ee01fe10ea5fa61 SHA-256: e30dd571c8daba828ebb79691a9cb7164f72ac347a6d3b434823440f3f03f74c
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious link distribution scheme. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://medvor.ru/uplcv?utm_term=most+downloaded+android+games+2020 PDF link annotation
    • http://tlca.com/Content/uploads/files/9354468963.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/65052644871.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/juponidobadetune.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b66f64fcd2---tigomipadixorixared.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/92669669354.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/66124689993.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/wutudapegelivugafikupu.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/11802169667.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/toferibapefugu.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/5323785052.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/69252586075.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/tipoza.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/sapibumisotaxemuda.pdfIn PDF document text
    • https://ijp2.com/contents/files/28410902321.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/1120103551.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/jexolikenawaxo.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210912095113.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/dir80scpo561ls4gci7vvqfmm7/10833666343.pdfIn PDF document text
    • https://flyags.com/editorResources/file///50461811335.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613772c4a9e29---zokatofoxajunutanusid.pdfIn PDF document text
    • http://borneneskontor-landsforening.dk/userfiles/file/tilawelanutera.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/2342467506.pdfIn PDF document text
    • http://nessium.net/userfiles/file/fudelemirufanok.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/87154910984.pdfIn PDF document text
    • http://seto.cz/uploads/kofexegaxaneliburazupa.pdfIn PDF document text
    • 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_off0000b81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB81D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD034 10912 bytes
SHA-256: dac6c98672eea9ceb6fadb1696868132c9d3d2e7b0adcbb2a6d4e333c8403a3c
font_02_sfnt_off0000e95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95D 15132 bytes
SHA-256: 4a9812648b1200448c639bb935a2961512cbf5ea5d5260a9331c8a095826a6b5