Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d41552beefb7167…

MALICIOUS

PDF

86.1 KB Created: 2021-09-10 11:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 8d17529d54e307513c4ace1d1854c64b SHA-1: 3495e06ffcee3205dd1bb65d22b8654d57ccc094 SHA-256: 4d41552beefb7167daadbb3171c4a72eda055fd4242efdf4327d15e33e03e69c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript (T1059.007) suggests it may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=best+need+for+speed+game+for+android PDF link annotation
    • http://lnianemarzenie.pl/userfiles/file/dixudoluposanovutixibo.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/49999524830.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/ledakisiruj.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/95018402735.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/39592469230.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/614f7d3dba2d348286c0e1c0a8636c1e/pipajo.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16130a98dc6a54---larerunuva.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/e29a7acd99576e8f95fdebe7f54ccb35/tepigujifu.pdfIn PDF document text
    • http://heureka-cz.eu/files/74478939383.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/89305508010.pdfIn PDF document text
    • http://hasyo.net/files/file/88757767668.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/pawakogezesoza.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/vakupot.pdfIn PDF document text
    • http://xn--hh0b97d8is16e.com/userData/board/file/74499284484.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/jaxulaxikukamopatan.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/89138750028.pdfIn PDF document text
    • http://www.klccpa.com/userfiles/file/In PDF document text
    • https://tskrea.com/userfiles/file/1424851799.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/bokof.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/xilirudatoxuxeponevodelu.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/xuzagix.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_off0000ebdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDC 10848 bytes
SHA-256: 0b7d9d464705dda0954de15f54742d8e0e11d15a83820ccef82d44e69f72a9a3
font_01_sfnt_off000104b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B0 18288 bytes
SHA-256: e0a598193be1ff8513d303c26f29f1eb5d94d1f0c541117f8befcc0291adc204
font_02_sfnt_off000132c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1