Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dbea10915960f5f…

MALICIOUS

PDF

84.2 KB Created: 2021-09-02 23:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 98f8ea587e7259f29535f60d24e60723 SHA-1: a7697de3ff56af0afd89081415c14d2ae68b816a SHA-256: 9dbea10915960f5f28157bc4e7ab86bf93136f7ed46f441d07e5f0fdeb3e9047
96 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous compromised websites, many of which host other PDF files. This suggests a tactic to distribute malicious content or redirect users to phishing sites. The ML classifier strongly flagged this PDF as malicious, supporting its role in a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/1e9d23529a9c814316a0a53871265d5c/rujixitezovokulol.pdf In PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9cf76fd42---zofutofavob.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7d3e3dd8d---nixewuzokanej.pdfIn PDF document text
    • http://teraval.cz/res/file/puzuvix.pdfIn PDF document text
    • http://kunbot.com/upload/files/turagozuzamib.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9514c10a1---21556912851.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b799c978c91---gisejirixi.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/gabujelamupupebix.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/nujamozedixawore.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/a7f51198e46e69c6a02113957359fe3f/38273777007.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/87473597293.pdfIn PDF document text
    • http://cgemfoco.com.br/ckfinder/userfiles/files/gijujixisud.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/xoxaxuxuditufo.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/b372c88c62774db5f2a2377832eb8554/setexufewumenususafisug.pdfIn PDF document text
    • http://deficanderel.org/clients/6/67/674a09facce11b7629d390eef9534ff9/File/8280779784.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/fuwijuverel.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e6a626781b5---vorawodafewez.pdfIn PDF document text
    • https://ikima.fr/uploads/file/pimoduzenokebu.pdfIn PDF document text
    • http://bendhorseride.com/userfiles/file/pamefofotasebukapi.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/botewevimusexojarog.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/60194750854.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/kukfdamo94a4tld7uhfplvbs90/24892809867.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/416c58a73b20cba684e025a10d4178f5/darawutimurefuruwapukuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=autoclave+reactor+design+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93C 18532 bytes
SHA-256: 7e67a363c5b88c24d1717d49dcac1bf154ad2a74748d200e2925198223b82382
font_02_sfnt_off00012992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12992 10940 bytes
SHA-256: fce9449444d7ffae0f3f3b8acb88989f80a662524ff67a8becdaf9adb57c9b5f

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