Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eab9b9123f4ccd1…

MALICIOUS

PDF

80.0 KB Created: 2021-09-03 10:29:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 60a55340c1854ed5cb1b540f8b81f7f3 SHA-1: d7d998e31de57c872f90eaa3c8713726f38db2c6 SHA-256: 8eab9b9123f4ccd18e9e9ec7e65dde74b564a5b15d8124358767eaa90c87b7e1
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the presence of numerous external links suggests an attempt to redirect the user to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://coretry.ru/uplcv?utm_term=electrical+drawing+reading+pdf PDF link annotation
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085df6f32b4d---87254937737.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/xaligidase.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/85678513727.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/doginofasipazavadaxokebo.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/2447194d03754d4db92a50dba0d683b4/duxifigevopalilitugizi.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/voruloxapepogefuvejupuv.pdfIn PDF document text
    • https://tosto.cl/ckfinder/userfiles/files/gekub.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/38650853203.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/mevudanenenifemowujusa.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/5b6f338e80ff556495d5b282f41f3e48/letedonaninuvawanifedadod.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/sudanodiwilikugijofu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c650a06207b---xizoso.pdfIn PDF document text
    • http://apvn.info/userfiles/file/nolejunejivazu.pdfIn PDF document text
    • https://scriptdd.com/_file/file/64860410245.pdfIn PDF document text
    • http://stagnesreunion.com/clients/e/ed/ed16748122b3ff8ec97113314e0446c4/File/kukiwaverebewakowuwogena.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/e885e5da3f694d2852cb898574eb4dc1/jeduzow.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e7abbac46---75274722225.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/babolojapulimogiwe.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16089c1712079c---83272051329.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/8c04f87fb24f436bc336ae55ea7a5c31/rebewuzoburenopon.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/v9jrfotjd3j8id0ejsve2unpki/64224141206.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/72f536f8bb675da627d827a87789386f/bimakezud.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5b9258f03---fanaturiroxavozaki.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/37502137335.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/9520138213.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_off0000d58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58E 10576 bytes
SHA-256: 20bb14f92da97b130b1f606f7ff70fcf8d537965d90c0b634592f00502fe79b9
font_01_sfnt_off0000eda2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B4 17456 bytes
SHA-256: e7be4702db0c146492d1149927390a174064d4fd42fadfc6fa3302a482ad3870

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