Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e13c8284fd2a466…

MALICIOUS

PDF

85.9 KB Created: 2021-09-04 14:35:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cfd455112a6e5327c0bbd1b81bf8efa5 SHA-1: 77d945c8a392b102f75144fd828133062bc20cad SHA-256: 7e13c8284fd2a466bbb8846ae9ade4c1d10a3d324e4662f2790d7b84fa3f9cfe
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous URLs that appear to be part of a link farm, with many pointing to compromised CMS uploads or disposable hosting. The presence of these links suggests an attempt to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://chcial.ru/uplcv?utm_term=idioms+in+sentences+pdf PDF link annotation
    • http://cariboohose.com/userfiles/file/36624125854.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cca4724c28---vuvotog.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/17766515422.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0006ed68d---poluru.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/feputagagijavake.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0d824cff5---32966314131.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/lvsn29gi99c2seumif0oo4ocun/kowurul.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/6442947504.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/siwevigi.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/sekilevebejilupazujowa.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/jovenowevakidifagigodaw.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/mepapebuwubejanosetinoriv.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/log6e7oo2lph1fio0vpp392sus/sefukajimu.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/15914822295.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/jogech1f4beir1p8mr78q4qu24/bixebudexizebivabe.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/6pbo30o6j35lcph2fuooh4ismp/73355038897.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/f64190036eb5c884cea0803f1d713f14/bolokoka.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160b12cfe1c385---kutovorekasuvisuxuxufilon.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd51cc9265---71935590713.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/uki5u8cvofm6d65v5f73fmasfq/819902159.pdfIn PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/98e273ccab9203d1c50228d11b8988d4/82558159105.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf53ccc6dc---76597776876.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/woxejenomepajagedixokide.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_off0000ebc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC1 18308 bytes
SHA-256: 47a6608bd9144c58d2af71abb5d15537cb6190d6cf0816f345a3d5be54c91c3b
font_01_sfnt_off00011a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13281 10424 bytes
SHA-256: 2d4f289ae5693b8539d5a0fd5de1006e7a1ab2156133013e21ea0ed5bc6c55ca

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