Malicious PDF — malware analysis report

Static analysis result for SHA-256 1faec95590f82339…

MALICIOUS

PDF

82.4 KB Created: 2021-09-20 01:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 03095d24342d72c44afae2c11a38ab38 SHA-1: 446e940bc590f72c0dbe5e8797860c11e398e356 SHA-256: 1faec95590f8233908db209d07285e74134f21df7f93e99fbf194dc3b4497f3b
136 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content likely prompts the user to install a browser extension or update, a common tactic for phishing or malware delivery. While no scripts were directly extracted, the nature of the URLs and the lure heuristic suggest a potential for JavaScript execution or further payload download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://philabc.ru/uplcv?utm_term=android+chrome+dark+reader PDF link annotation
    • http://hanilkwanla.com/uploads/files/kiveti.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/nerutezuvenizuvoku.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/siwiworixejemadiguwabo.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/11390315370.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1631588129_784622a931.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/bekowoxoti.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c3952153d---wobopubanoxaj.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/99329899275.pdfIn PDF document text
    • http://esistore.be/userfiles/file/bezito.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/85190152658.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/negejaniresudabeka.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/16492704501.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021092005512818.pdfIn PDF document text
    • https://cebubigsellers.com/userfiles/file/50558558881.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/88948629626.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/0e3ffecb7b53b568a7fccd48182f3ead/bepezuluwezozi.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-11/20210911222350807974.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/somejuxem.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/95253654d033274f2b987f1e51508bf6/97460279347.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141aa587c820---badebafirato.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/menakidad.pdfIn PDF document text
    • http://beijingteye.com/upload/files/59301324967.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/japaduludoxozapazirumuni.pdfIn PDF document text
    • https://memo-log.com/userfiles/file/kuresuwugopevobawefe.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/wibaruwi.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_off0000db1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1F 18872 bytes
SHA-256: 61f905c061a0e1bed1db1cfdea00a67d12040f008d62ffc162c104373dfac6a9
font_01_sfnt_off00010c1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12432 10396 bytes
SHA-256: 96216e73de849cb152fede05d1648661417cfdfd6fad6c9c4ac35b8a069feaee

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