Malicious PDF — malware analysis report

Static analysis result for SHA-256 797944bcd5b34497…

MALICIOUS

PDF

80.0 KB Created: 2021-09-19 23:53:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 73924a4db1299640e9350299522ec92f SHA-1: 3f96f5d04b34916367fba4fadca35b607ba48485 SHA-256: 797944bcd5b344976199484cdc3cdd72e1054ef83d8e632aca51ce26cd1e13cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://pixomot.ru/uplcv?utm_term=how+to+check+phone+memory
    • http://happy-land.hu/editor_up/67091054989.pdf
    • https://newline-eg.com/userfiles/file/tugidoku.pdf
    • http://chrisdepanneservices.com/Sites/cds/files/kamovagilo.pdf
    • http://railwaysrailroads.com/upload_files/files/xatibode.pdf
    • http://katyababash.com/images/uploads/file/88059193207.pdf
    • http://krasneclanky.cz/uploads/99522322007.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614397f03365d---48625891806.pdf
    • https://bednidhitraders.com/userfiles/file/xelagaximam.pdf
    • http://centreforeffectivecoaching.com/media/file/68577392465.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355a6f7bc50---xepimo.pdf
    • http://zulassung4you.de/bilder/file/rofezutonodadujinoj.pdf
    • https://energooptima.hu/upload/File/85016215241.pdf
    • http://artetendasud.it/userfiles/files/11071354918.pdf
    • http://asremajazi.com/uploads/files/loruratonoxolaxegezip.pdf
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/xoximovu.pdf
    • https://profession-your-dr.com/uploads/files/202109041956404685.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614467b2c192a---vigowivagusejenapa.pdf
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/69080295279.pdf
    • https://nieruchomosciturystyczne.eu/files/file/xefufoxiwisegijodexovafi.pdf
    • https://songhong.info/userfiles/file/85229930612.pdf
    • http://ueros.fr/admin/ckfinder/userfiles/files/79599246001.pdf
    • http://www.39koratmachinery.com/file_upload/files/34984372410.pdf
    • http://nomorecpapmachine.com/userfiles/files/59943004367.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16140bc03df329---refilolinijuxopa.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d477.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD477 16792 bytes
font_01_sfnt_off0000ec89.bin
a2e3076855bbfbea19f1e94cd6cee34196bee2c9fd8822e508b222c00b7656a7
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC89 18016 bytes
font_02_sfnt_off00011b39.bin
9b1ad1c3b4e360eb7027d5b815fff5efc3b4d77268829222695afa75894219e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B39 10452 bytes