Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb58ff32b7465527…

MALICIOUS

PDF

83.6 KB Created: 2021-09-16 08:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 92312f632d375071b44309c94ab57b07 SHA-1: 12aff24cc50481623a0dd8a9136dea179c83da93 SHA-256: fb58ff32b74655275153d1d59262fe712997d653a93b4b6f5b774c28512e1179
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also exhibits characteristics of a link farm, with numerous URLs pointing to external resources, some of which are hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://krisoc.ru/uplcv?utm_term=tutorial+membuat+aplikasi+android+untuk+pemula PDF link annotation
    • http://prime42.ru/userfiles/files/86022485860.pdfIn PDF document text
    • https://t-groupvnxkld.com/uploads/news_file/fogemipovede.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/65576844938.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/ladosesa.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/59672448624.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/jadovomozuf.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/javajas.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378d79b1076---lajivokenezolodapirox.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139deac4dfff---dodubisofenitid.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202108311818176253.pdfIn PDF document text
    • https://havilahbuilders.com/userfiles/file/94317751427.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/0714164068.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/nogironoxigozikizigidimi.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/bakigedub.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/garituro.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161368f2d6da74---xedokuwudix.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/20416377312.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/18852415775.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/19656210896.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/dupasusazanadisaz.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/tesizigefit.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/zeniru.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_off0000e5e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF7 10848 bytes
SHA-256: 63d27c3c60cd40f7b9bf92d5030196e13eca9128843a95216194bd1f867838fd
font_02_sfnt_off000116bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BC 16296 bytes
SHA-256: 0446800d4a0f161ff8bae7293dc1d7517a412adb2bdda716bdf33604846aca0b