Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7e03b62fc0c6eb5…

MALICIOUS

PDF

76.0 KB Created: 2021-09-18 02:19:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 3c3c4a6cc7c6459926cba232110be3d9 SHA-1: 39456c00a65959a8bdf1e4f4e44620bc1358e58f SHA-256: b7e03b62fc0c6eb588abb1b7f26eccf93a9ef36d0fd9f4cf0e8a412a6d4d6253
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The embedded JavaScript stream, combined with the numerous external links, indicates the potential for a multi-stage attack. ClamAV detection further supports the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • 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.
  • 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://pistant.ru/uplcv?utm_term=ben+10+ultimate+alien+cosmic+destruction+ppsspp+iso PDF link annotation
    • https://balbok.net/admin/ckfinder/userfiles/files/79029895753.pdfIn PDF document text
    • http://poultech.net/d/files/2273338899.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/zedeseziravomofudijuruj.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210912222225725.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/57290249741.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e75ec67f7---29885959268.pdfIn PDF document text
    • http://mfahk.com/upload/files/xaxekaferapedasonudon.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/21224650112.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/21960746131.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/sewufosawidewuna.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1af61df8b---rurezigofubenigo.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/95539120950.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lixiluxozi.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/87644561069.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/kulutijagawumimuxanalexu.pdfIn PDF document text
    • http://sigmabhp.pl/userfiles/file/demikifunekogunamaja.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161416c913cd2a---46361891171.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/19307540474.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/19646843781.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/98117388815.pdfIn PDF document text
    • http://lactopad.com/uploads/files/tarofozopaxij.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130993409405---22318787305.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/kegipe.pdfIn PDF document text
    • http://arndt-fahrschule.de/userfiles/file/38194126676.pdfIn PDF document text
    • https://feldmann.pl/userfiles/file/fivadikiwusafoba.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/34608872476.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_off0000c010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC010 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD822 18548 bytes
SHA-256: 2d494cd596b8065ae0b02c75781f29ad56fc2f7ee6424ad13af6de184f39e7f9
font_02_sfnt_off0001082d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082D 11000 bytes
SHA-256: 068e21f5c87d633864ba28e1eb8f3240cf43fe3c549ac902935da91826af61c1