Malicious PDF — malware analysis report

Static analysis result for SHA-256 739ba1650ef8d82a…

MALICIOUS

PDF

86.8 KB Created: 2021-07-14 05:36:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1bfa26a156093247b9f4e51536729415 SHA-1: 9b27fbb0bb6bbd8c5bd1313aca2f34b5770757c8 SHA-256: 739ba1650ef8d82a7d2c94cb8095e7f5fdad88883b3f43eacae0ae886353893f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many hosted on compromised CMS uploads, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded JavaScript likely serves to execute malicious code or redirect the user to one of the numerous provided URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://allytemp.ru/uplcv?utm_term=carry+the+cross+daily PDF link annotation
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609253bde3b3d---96026531584.pdfIn PDF document text
    • http://vickerycarpet.com/uploads/images//files/48159162025.pdfIn PDF document text
    • http://ud2-140.com/files/fomutetavonunitego.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/450abaa07fae4cea5e80dd735605ce75/44655470846.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/3p67lgrvptdq03v3066elupddn/lazoromilirotoxeloxulu.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9187275ec7---powerobofadatoginesig.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfef5c050e---6693547362.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210612042528_8nrav5.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/4320495570.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/5959fea3ea8850fc730696f2125e1e70/56218313698.pdfIn PDF document text
    • http://bdn10.cz/files/file/tomofamano.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ca3e8a4f7---37231954416.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb8bee7d02---xudamuwaxizu.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/fuwidunof.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/bijuwewifatome.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/45710664860.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/lirote.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/tjtoqllvsg2gjkfcslkq84s7n7/54413613717.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/gizewatarawe.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/s4klij97n9rprgougktk0f8qaf/sugodetesuviruvuxelo.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987b83d3f79---61339437985.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#Referenced by PDF JavaScript
    • http://purl.org/dc/elements/1.1/Referenced by PDF JavaScript
    • http://ns.adobe.com/pdf/1.3/Referenced by PDF JavaScript
    • http://ns.adobe.com/xap/1.0/Referenced by PDF JavaScript
    • http://ns.adobe.com/xap/1.0/mm/Referenced by PDF JavaScript
    • http://ns.adobe.com/xap/1.0/rights/Referenced by PDF JavaScript
    • 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_off0000f13a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13A 16628 bytes
SHA-256: fb6cc03c799ebe6aefb4dd567e332c24fb1938b2b41825b7fc4367ea595a46f1
font_01_sfnt_off00011c71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C71 10508 bytes
SHA-256: d5be9cc6256b1ed1063ae8992e7cc31ada4d8e79ad2a3c0d9663c624dfc21a55
font_02_sfnt_off0001348b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1348B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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