Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4a91e3f126e2570…

MALICIOUS

PDF

83.0 KB Created: 2021-08-22 05:59:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f1a1d0d7200e00bc47c452fe1f5c78a5 SHA-1: 49160f51d836814ab6127dbc4afe89430b4bc2cc SHA-256: e4a91e3f126e25705dc8c40e73c168ae606ffc5e46edfec9e058d99a84b38130
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code or initiating redirects. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the final destination. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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://huntic.ru/uplcv?utm_term=livro+como+fazer+consultoria+em+servi%C3%A7os+de+alimenta%C3%A7%C3%A3o+pdf PDF link annotation
    • http://48bulls.com/js/upload/files/2270595763.pdfIn PDF document text
    • https://jetaime-shop.com/files/70564154557.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/xopoxejanazegewaxawiwa.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/93845869160.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/42033702446.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160701b0af1a4a---87615574696.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/1130363510.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16087d2d169959---14599177158.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/2dc9a657ae65d62366091f4dab536aa8/ruwijatapiribegovebutege.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/91413805616.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/1dc86875b62c9a98cb368a1dfda6e1a9/larawujisusonawuvukasax.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610d58f58f2c3---wizemupabo.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ca0e30770ee---31261880479.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b73267e441b---37069158602.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c449dd4d3---xegatuwedusorit.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/gafuzososita.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/d90056e6f3da10fa0b4c9b50c354df16/70942540801.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/a025d8935462175b4c7d4d1e6cf4e477/mofexezaxodudekumilegik.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e9ffedbf0---46314894396.pdfIn PDF document text
    • http://namlongprojects.com/images/uploads/files/21002327911.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/2864844618527031b5ceb532378991a5/videvaloxavelemalipol.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/82522502059.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_off0000d8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F2 11428 bytes
SHA-256: 63b32e33bd85acaa34251739504882981bed022e411a7ad8b7487fd5ae192c6c
font_01_sfnt_off0000f33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B51 19840 bytes
SHA-256: 7e02905686f944127561752b2c2dc4b89d13ace08dc9e7e5c0529dfbb3efa836

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