Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd85de8f4896cb4b…

MALICIOUS

PDF

70.8 KB Created: 2021-09-26 22:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 20d5685bb132d1ee846d2c34165a4acf SHA-1: d1358d35941f0e0f9ef2788eb721fd2d0bb55f7d SHA-256: dd85de8f4896cb4b325b205f886578f1eb03efc233099f38afa31da9189262a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many hosted on compromised CMS platforms, designed to direct users to download other files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to exploit users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://hardlineconstruct.ro/app/webroot/files/userfiles/files/pevidovoretoruf.pdf In PDF document text
    • http://pioneerbuzz.net/userimages/pozat.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/nigasulov.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/feriwubogubixuniser.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/68990155895.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/wobojidadu.pdfIn PDF document text
    • https://wecareprogram.org/images/file/96864790614.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/50517268963.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/51536486770.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614df416401d0---99268204740.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/sidaro.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109220206593368.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9a1fabd5a---wewibuneviraxeputed.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/pujajonozepaz.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161368163b409b---60139461352.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/v8qcktmmcbmke3vnfm7bhgtcdl/29718881609.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/ledizinumatoraveni.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/68576508395.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/18424954459.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/supara.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/14558392506.pdfIn PDF document text
    • https://dptech.vn/uploads/files/tajopijunitijeboxame.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/36db1b35f326fcf09064cc504d5ccd5f/18362776207.pdfIn PDF document text
    • https://norservis.info/files/files/61408485017.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=gta+5+ppsspp+iso+file+downloadPDF 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_off0000b378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB378 10652 bytes
SHA-256: d32e99612fea2dad1dadf5b4625d54d574809a228f9e2241bb0aaec8ea0ad4db
font_01_sfnt_off0000cc21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE433 16064 bytes
SHA-256: 0b89b1a3a1e540124f29930a5849d78af67bd74f53725180d81e25207c5c7c17

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