Malicious PDF — malware analysis report

Static analysis result for SHA-256 d19c2631bc7d374f…

MALICIOUS

PDF

89.8 KB Created: 2021-06-28 13:29:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 0d302cf56a7080572981b981eec892c0 SHA-1: a3b16c737da6c546b9be1a023fcc995e32e29b90 SHA-256: d19c2631bc7d374f5940181a94f22fc8951c9a6618ee4307b6678ecd31510722
156 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 CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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 http://agiusfuneraldirectors.com/files/file/vekejitobuvasetepuvala.pdf In PDF document text
    • http://citywideok.com/clients/75789/File/tijaxoduvekuzagaregarabiz.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/62603249423.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/39e0ff5075ce12123f4b37844a0ec446/19226725259.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c772e2f035d---gusufasugakewepig.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/xarunasakegigamupod.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9925aed0bb---kovifuvipazob.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864e2b7f74f---44502184385.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087b60896900---58340027719.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/sabof.pdfIn PDF document text
    • https://intellicapital.in/ckfinder/userfiles/files/mumejomadofolaferujomonap.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/uus28ir19aj87j8kjc4hf2jbrv/nexej.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768c495cc20---35954083096.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/97dcfc1e2557b174b29e97030d559057/wuxelixajoruvipusurus.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078fa79ae4c9---76499655562.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/4lbsg5sjd4gel7r4ftacv63jkq/85906776443.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/dozeneranatok.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef0513f894---vosumidizap.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608188c664566---xowomesa.pdfIn PDF document text
    • https://cncunse.com/d/files/wolovabigofeloji.pdfIn PDF document text
    • http://thelewisfamilyreunion.com/clients/c/ce/ce72a6ed4f7059d305e3bbfb121cee90/File/xesed.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac95a27e06b---68769310519.pdfIn PDF document text
    • http://ridendo.cz/files/file/15063355790.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/tabovexofajaru.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078d8a23eb5c---ratovagunijojir.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb600a9382b---xawokamojokuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=an+injunction+isPDF 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_off0000ff7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7C 16836 bytes
SHA-256: babde7fdd285303aaaec29a4fccc1aac8d4d5d4e7ea296ba05142b902f897b4e
font_01_sfnt_off00012b87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001439d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1439D 9992 bytes
SHA-256: 6ed5ca1941dbc47b7097c6319a8715b8e72cd2ecac8d755986c7b93bf167014a