Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee6190359e7464be…

MALICIOUS

PDF

79.9 KB Created: 2021-09-09 16:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5aef8293252ceaed5097d10581601207 SHA-1: ed9ff7259ef9bef5a7271b2cbb8c094cb87cb371 SHA-256: ee6190359e7464beeb0915259df14197718b2adf39ad74fb623ae5bf1404633d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites 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 distribution. Although no scripts were explicitly extracted, the nature of the embedded links and the PDF structure suggest it's designed to exploit user interaction to visit malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://cherryontop.pl/upload/fotki/file/30832682633.pdf In PDF document text
    • http://mrcookie.tw/upload/editor/file/031014135656.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/gaxilozujofelanufezuwelor.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/nojanuwidatekaxerezu.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/potebis.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/3gtgidjo8edm3g3sk7si27d3q6/816056540.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/96856669869.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338047dc56c---2187341240.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/11784584339.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16304612013305.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/xizibavuxejixe.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/78366936770.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/73735045013.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/78543015756.pdfIn PDF document text
    • http://gr-chem.com/upload/files/45366664404.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/vedafizetibidowowopefim.pdfIn PDF document text
    • http://nenorm.com/files/files/xisinat.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/lakuzijikokogetud.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/temejopesoporike.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353211f3470---85502339608.pdfPDF link annotation
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/76151623527.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/timaf.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/sotajoniwax.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/e86301fd13ab808b3c7fb6d953836791/dibusanowasoxa.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/90148878361.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16135bc2c27045---tumulorolumoziwiso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=reface+app+full+versionPDF 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_off0000d49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49C 10588 bytes
SHA-256: 41f94f8aabc124d2c59a0388f03ec68ec1db727c1995d58a9776e5acfe5b0f55
font_01_sfnt_off0000ecec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEC 17452 bytes
SHA-256: cc36c5bb25f52da8c99748c24ab3f42c5f5ad74b937f47746634a5855efa5e5f
font_02_sfnt_off00011a4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1