Malicious PDF — malware analysis report

Static analysis result for SHA-256 8066b790c624e4d4…

MALICIOUS

PDF

70.5 KB Created: 2021-09-25 22:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d95c0bf5b7561ad4f96fdc4597ce33a1 SHA-1: e01bd6a089106c8e12dc02936c4df68c2e2e3460 SHA-256: 8066b790c624e4d4b6dc6b683ffb680b528ecaa0ff4b677cc9cdd9dee7144f94
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://irlanc.ru/uplcv?utm_term=ben+10+race+against+time+full+movie+free PDF link annotation
    • http://www.pattyn360.com/upload/forum/files/86793530570.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/piwod.pdfIn PDF document text
    • https://carpenterstouchnj.supremeroi.com/FCKeditor/file/5907013766.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xisutegedavuwaduse.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/96488964158.pdfIn PDF document text
    • http://starfishdowney.com/uploads/files/bowutel.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210919135727.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/56521070647.pdfIn PDF document text
    • http://heichapuzi.com/uploadfile/file/fenuturenumidezuxigidijuw.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/c89b91a1d1a99e06aa9d8b7e05aedd8f/lelusujixogitudagatek.pdfIn PDF document text
    • http://grimastone.ru/files/tidedizevagexofekaduwi.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/38607127049.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/7780264072.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7c8777fea---8494466217.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/tuluxozidijajemani.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/lezus.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/besebugupadupi.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/lojumejivov.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/jusisugabafebonarukiz.pdfIn PDF document text
    • https://coevent.ru/upload/files/31492137425.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/loxajatedetapopeso.pdfIn PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/25404142276.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146521e99ea1---69742273612.pdfIn PDF document text
    • https://tekstilkent.formenemlak.com/upload/ckfinder/files/47369445189.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/rurikonuwajekolob.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/89979452650.pdfIn PDF document text
    • 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_off0000b484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB484 11072 bytes
SHA-256: 82a3c9f4e60c8d382bb6e9d310e43bb7849cf1b834e18c1a5fa41b1095b04aee
font_01_sfnt_off0000ce6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6E 14876 bytes
SHA-256: 4d68a78e1b2eac3f07b30d2b85e6b8d77d933a43fc92d9894e4fbf1a8ad111ca
font_02_sfnt_off0000f3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1