Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f9ea49e2f4265b3…

MALICIOUS

PDF

99.2 KB Created: 2021-07-17 18:33:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d8143d3a50e4baad59f169c24627fb07 SHA-1: 6a84719d032a77dfb3d3bd5e308c15ca954f9bbe SHA-256: 7f9ea49e2f4265b388beb532c2d1a76a79bf9d04af1e9a643e5a867356a4d141
144 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple links pointing to compromised WordPress sites, indicating an attempt to redirect users to malicious content. The heuristic 'SE_PAYMENT_REDIRECT_LURE' strongly suggests the intent is to trick users into changing payment details or wiring funds. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

Heuristics 7

  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160983494bcadb---godivawosenamonaw.pdf In PDF document text
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/f46cee4e871b7b2e687bf70e1ebc11cc/larirowurib.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/emf6tipu6luf67ghr1vu65ha87/8127116572.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/foluwoxonemuzo.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/bf6bd9ad654d29294075e013c024ab8f/35766286542.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/b7295557e1ba53d175596d05aa93ea93/musodeg.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/366f26df05a2f88b1856073914b7aeff/dimesanafotezilanukali.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///38607515708.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a6be096d950---85782829570.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/7f098296afc061bcc6f45d5ef172ad4a/dakosate.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e21fc80a5d5---60296364917.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/b958295777fc8eca5a896587d318ce3a/34981438728.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/36206137800.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/22882162429.pdfIn PDF document text
    • http://nabisori.com/userfiles/file/37090896433.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/kokarisimebidotojotozew.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/5591238871.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c92da55e11f8c688189724d550dbe43a/22327142018.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c931fe3413---rukuzoneb.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210610_092140.pdfIn PDF document text
    • http://vejwun.cz/images/86186069531.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/4879392097.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=the+time+keeper+quotes+with+page+numbersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C0 17724 bytes
SHA-256: b973f3070028f8d6ebe2e5c5a9dccc28a078b61e31e60a18a56e63955585bd1e
font_01_sfnt_off000136b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136B9 16060 bytes
SHA-256: c6549f22251a7c672008a5db7f07691c42d3183154b8b4cd03972a27c3442328
font_02_sfnt_off00014bd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BD0 11180 bytes
SHA-256: b1de87939be33f5770865f5bbcec8acebd296511df22abe38244720b51daf0fe
font_03_sfnt_off00016550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16550 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1