Malicious PDF — malware analysis report

Static analysis result for SHA-256 8148bb0d1329bba6…

MALICIOUS

PDF

71.6 KB Created: 2021-09-26 21:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 52f2b36fb568c234c98fd2ffd776bffc SHA-1: da05b78fa04314e790d5a807cfec8c48ad08cc53 SHA-256: 8148bb0d1329bba6c7fb1dd0f57f3751eb3bf048c266427fa07de086d7fa4f93
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm or phishing attempt. The embedded JavaScript is likely used to facilitate the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 http://gfzgt.ch/upload/file/govikarivifobalivun.pdf In PDF document text
    • https://flexi-cms.com/uploads/file/24540855301.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df019f0f7e---56845567429.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/bekaxom.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/fonesobelajakikabobi.pdfIn PDF document text
    • https://uangraja.com/contents/files/22655836071.pdfIn PDF document text
    • http://minhnguyenvn.com/uploads/userfiles/file/94143408771.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/41431389556.pdfIn PDF document text
    • https://96662888.com/editor_upload/file/97014033602.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/bediponerox.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/73847941481.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/lujinufetoremoveweduju.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/24446742493.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/68702200.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/71295bee9301c07351b222214510632a/66964489861.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/geriwuti.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/wopiduw.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/6524496573.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/83986141939.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345523c6e9a---diribipamawitumikuputul.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/22280474905.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/38946842122.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/rotunasenikepofula.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412acf8a5bd---77113988272.pdfIn PDF document text
    • https://fundacjaartfreeart.pl/userfiles/file/nijefukiva.pdfIn PDF document text
    • http://maytinhnangdong.com/files/uploads/editor/files/75845106863.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+play+games+with+android+and+iphonePDF 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_off0000b3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3CD 11028 bytes
SHA-256: 5c93163c7804193712e348ecde2e6df1f144909d17dc6cc23c63d71c5dd31b2a
font_01_sfnt_off0000cd1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e52d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52D 17468 bytes
SHA-256: ed9851bbf62fbc414e27b2181e71f61a81cbf65189aa5dbe87250cffb78bf0ae

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