Malicious PDF — malware analysis report

Static analysis result for SHA-256 0079b0b82957d5ef…

MALICIOUS

PDF

71.6 KB Created: 2021-09-03 05:14:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6c228b8f16af1e92b90e156f1a278796 SHA-1: 7f4a4d47337ed7d7eb224fdf93a43243839818fa SHA-256: 0079b0b82957d5ef69d5c50b04747cea6ce1dbdbd32aa5e12a1336d33bf1ae80
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier strongly indicates maliciousness. While no scripts were extracted, the presence of a link farm and compromised hosting URLs points towards a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

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://crysiq.ru/uplcv?utm_term=teach+yourself+korean+book+pdf PDF link annotation
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16092384606ca8---67320260332.pdfIn PDF document text
    • https://srmhospitalities.com/images/bulk_images/files/mesatidal.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42307551966.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee47ece3294---42018511203.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a767940700a---80426101892.pdfIn PDF document text
    • http://carszana.com/image/upload/File/99746949421.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/56964368207.pdfIn PDF document text
    • http://palami.by/images/file/45017715839.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/22147320827.pdfIn PDF document text
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0e842e0f4---54839620474.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/timimutojuperojibisosizig.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/88627164608.pdfIn PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/pozezaf.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/7446c455bb39b099d26dd13c7b6ed30d/34557634921.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/buverijexebonemikafogoz.pdfIn PDF document text
    • https://starwebline.com/calisma2/files/uploads/nenodamuwowimokataxanu.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/36rfjbh7hio826hj4iejn3d1m0/mifilor.pdfIn PDF document text
    • http://askort.pl/Upload/file/2259224307.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/5885b155810faf0d1faf7a2b38e6d925/51325666846.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021072619451280554.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/c9d96146e8a0c410e963013de0edba8b/vegugogusofulus.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/disor.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/0c26ae8bf6716ba4d63bcfe5dd88e4da/welizibitapolowe.pdfIn PDF document text
    • http://artospace.com/pics/file/mefifekavonizejitigapemit.pdfIn PDF document text
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/sovotupug.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_off0000b6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B6 16144 bytes
SHA-256: 1af9bc99631b6dcca7bd22b790833faf83ab57032873dd4a5856f9636427ada3
font_01_sfnt_off0000df6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF785 10936 bytes
SHA-256: 3715e849743fd8dab9c341ea196e74f7f2ad0aafe0d74f5b799e4154e67132a3

Open this report in the interactive analyzer, or submit your own file for analysis.