Malicious PDF — malware analysis report

Static analysis result for SHA-256 b24422ebd888f3e8…

MALICIOUS

PDF

84.2 KB Created: 2021-07-01 14:42:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e0953d427bb7be1f838f2bf445b4e720 SHA-1: 97bf9fd7ae32a610e810727bc56124faaeb01793 SHA-256: b24422ebd888f3e828d5183486ac6ac8a6fed6772eaa7e425383e6772f9aef30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised CMS upload directories and disposable hosting, suggesting it functions as a link farm to distribute phishing content or further malware. The presence of external URIs and link farms strongly suggests a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://oniceh.ru/uplcv?utm_term=the+tempest+and+colonialism PDF link annotation
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/297beb7a20177f59c003c085101da0db/79492016606.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc00ad0c9a---mopewukinejifu.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add262c9515---xufuxuxokomaramevesitivi.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd11647b884---57415343601.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/kosajadawodiba.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e192980984---92061699380.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bd87971b2b0---47285994207.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/fcea59e2d936b2b1591b12f2271ad5c1/rolafufuviketubidisof.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082433f45361---4683093804.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/22570608820.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/50981426392.pdfIn PDF document text
    • http://gfb.it/upload/fck/file/korofela.pdfIn PDF document text
    • https://robertbah.si/files/file/rovefole.pdfIn PDF document text
    • https://soechi.com/userfiles/file/69377312959.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160af828b3c7f7---senugugosa.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/dr9t1715fh9e3e5ukunkpnofph/50130636236.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/cde305053b684f34767cebbd492f454d/zegidonuvagajemewirotekab.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/4a3388e9319867917bf5b9dddf8c8875/makefanuzotixove.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608236c1855be---76476700239.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/avpba52haf6c7t7jbspm6vs962/jexaboxusojevovon.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/gipitanuz.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7399cd654---pololoturukaburipusudu.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/2058c833cbe3d42a8aa58a29744564ee/47761090693.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/9463881398580050e3d19ad62a6583c2/38236175068.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_off0000e67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67F 17704 bytes
SHA-256: 4b86c1c7d8d5a4439b5dbd5ef52f776ba0a287c8e76a82497fb22f66e58192fa
font_01_sfnt_off0001144e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144E 10644 bytes
SHA-256: cf1ed10e2e20129890afa038d364a1e278ff8cc2f89776dec1ce2c3353c9ea47
font_02_sfnt_off00012c76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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