Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b9a35e63d82dc15…

MALICIOUS

PDF

78.7 KB Created: 2021-08-27 21:12:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0794f4f24ec37a176171e99fd1644a43 SHA-1: 10de601c00b40a3affc2f2d3739332e6f8d0f466 SHA-256: 4b9a35e63d82dc15d82f11e8576d5a916cbdd2e3feb8b4dcf0bd5ab35e89e52b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to multiple compromised WordPress upload directories and other domains. The embedded URLs, such as http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607701b940f19---25747077943.pdf, are likely intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9e6b9a02d---31724033338.pdf In PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/60687672353.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/tujasoselinenuravilule.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/851963e92901f2f6ca892ee7588f2522/xazufugobemuvuxivofan.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f3de8e7f1---famojedesetuzoziweniribom.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/5739276425.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/9b5283333c6d1bdf83a31f9a7e45a23f/97547552028.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102fc707f0fd---32924490149.pdfIn PDF document text
    • https://kultmotor.hu/images/files/xipubigizafaf.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/vuvexadara.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/fobijegekujigeladavojum.pdfIn PDF document text
    • https://printsolutions.ro/uploads/wysiwyg/files/xuzakexalosalenij.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/dekipesumafoketotog.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607701b940f19---25747077943.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/gisitesezukudixo.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a64fcce6eb6---72419844987.pdfIn PDF document text
    • https://webaprint.be/img/file/zanebenivifi.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/xefafawolelizexawudog.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/fc11a862e76327f818851762658a175b/nuwepodubuxaxuwam.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa9f396718---pifufomomepiwad.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/9937099876.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/d0bddf943aeea16957f5c4c8bb43b857/bobizotovufifesiwax.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b71fd38bc---nulatax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=tomorrow+soccer+fixtures+oddsPDF 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_off0000cc5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46C 18520 bytes
SHA-256: 321bbe4fc376c94f50d50bd4a7787b908f614d8d063c96438ebad36a709207b6
font_02_sfnt_off00011487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11487 10576 bytes
SHA-256: 088b20d4b5edab8c5b25dec683744d13dee899dbf6694ea2de8f55e0d4f43828

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