Malicious PDF — malware analysis report

Static analysis result for SHA-256 3048bcc8f657a56d…

MALICIOUS

PDF

75.2 KB Created: 2021-09-17 10:26:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f870bba382592f6b15915417da68f6ee SHA-1: c99703f4bb11c26666564efa2c53b8e7f12583f3 SHA-256: 3048bcc8f657a56dcf6d85d03634c7cdc77cdcb30a5cde75b97498c0e5c7c2f2
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary function appears to be acting as a link farm to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • 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.
  • 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=purani+kachche+dhaage PDF link annotation
    • http://huiking.cn/uploads/file/162229057521.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d1d3231a0---62536059475.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210915_D790813C0F75D764.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/fepalefo.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kimezebuxigufi.pdfIn PDF document text
    • https://laps.pl/userfiles/file/dozemuge.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/71723890020.pdfIn PDF document text
    • https://nevisnews.com/userfiles/51117939554.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/161380d1d63ede---54462469860.pdfIn PDF document text
    • http://erdbau-rauch.at/38822943026.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/51498453216.pdfIn PDF document text
    • http://snuhonors.com/userfiles/file/97358477445.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/naxapavobuxugawamezoka.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/dosez.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/5763023376142f80797603.pdfIn PDF document text
    • http://badgerhillfarm.uk/19961888868.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/16781261481.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/42463463465.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/rasevifejenuximakidi.pdfIn PDF document text
    • https://kawanmto.org/contents/files/nujaja.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/27973203756.pdfIn PDF document text
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/15007233114.pdfIn PDF document text
    • http://polletnv.be/uploads/files/bosutanuduwewas.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f1983a1b8---95263640396.pdfIn PDF document text
    • https://atrax.eu/userfiles/file/7091710625.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161373a634dc57---lanaxik.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_off0000c29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC29B 17696 bytes
SHA-256: 94e278ab93e1d63e29c323b4ddbb51b38999d46e8f718d13b6bd5d0ab7a99ccf
font_01_sfnt_off0000f013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF013 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001082a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082A 10412 bytes
SHA-256: d3647bb77824dad03ef2492a61b1770169b6d78c1ecc09bf0faeed3fe90728ea

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