Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc27c48454bf29d4…

MALICIOUS

PDF

76.5 KB Created: 2021-09-01 02:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 64452feecb891a4cae26ce645482fca9 SHA-1: 4ef6506aecb382bcc7342927156dd9c6c5e5eb58 SHA-256: fc27c48454bf29d47ee6d37f368078558e0687b9d4293db842141e2bd6e1bfd6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also features a link farm pointing to compromised WordPress upload storage and other external URLs, suggesting an attempt to redirect users to malicious or phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://louvre.lv/res/wysiwyg/file/41275693056.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f91554750---36568524385.pdf
    • http://gaishachuukobuhin.com/js/upload/files/zekakimalutipejatagol.pdf
    • http://stainless-faucet.com/uploads/htmlupload/files/tanevejimefilejajubojitu.pdf
    • http://densayhongngoai.com/uploads/userfiles/file/57440608296.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac40ff084cc---41035375019.pdf
    • https://a5productions.com/home/a5pro/public_html/ckfinder/userfiles/files/rozadexo.pdf
    • http://kondicionery-vidnoe.ru/upload_picture/file/30102989666.pdf
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/sojotizesavegu.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160944b69bda5a---suloniguravagorusumomit.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/53f79d67c2ff814bdd287ca32d3b1a93/95978516411.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e188738e6f---sobagoxuwuradugipafibi.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a8247675d54---42040251187.pdf
    • http://younewstoday.com/task/userimages/file/73519023.pdf
    • http://centrons.com/uploaded/file/183307293060cceb2ade9e0.pdf
    • http://bioaec.com/userfiles/files/rumabaxopukafij.pdf
    • http://khangvietdn.com/uploads/file/8724381155.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba990313315---62193826032.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/d83f399ae7efa0d6d75fd849c48071e4/warelonib.pdf
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/jajosexawerupaf.pdf
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/63417281965.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/f1519d3a388a98e89782bdc297e6796f/82290981184.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160853252468f2---21934147802.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877d64da5dc---ripiwes.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a229f18e2---papuzomizafitojulamog.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=mcq+on+triangle+class+9+with+answers
    • 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_off0000c514.bin
dea86e214c6fe21dac001c240845b78173e64d48af4e5f7ef7d2a0f7f0095a5d
pdf-font-stream PDF embedded font (sfnt) at offset 0xC514 17416 bytes
font_01_sfnt_off0000f1ce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CE 16792 bytes
font_02_sfnt_off000109e5.bin
b9a8626e83d661ea9035b561be7afd18be0e47732b59ac2ce0f7e06dd8bd3b45
pdf-font-stream PDF embedded font (sfnt) at offset 0x109E5 10904 bytes