Malicious PDF — malware analysis report

Static analysis result for SHA-256 664574284db63118…

MALICIOUS

PDF

79.3 KB Created: 2021-09-04 10:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bfe51dc3f705a3d14e8e99fc60dacbe9 SHA-1: eff76bf5eb656d2e31eb2fabd1bc48264f71f2c9 SHA-256: 664574284db63118d3285fb4f68fd7d2edb5cf5d69a87b6af3d733001912a857
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malicious files. The 'SE_INVOICE_LURE' heuristic indicates the document's content is intended to deceive users into performing an action, likely downloading a payload. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://crysiq.ru/uplcv?utm_term=uti+pan+card+application+form+download+pdf PDF link annotation
    • http://simonhoirup.dk/userfiles/file/xirimato.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/88185722907.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/57627199689.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16080675742675---10848959467.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/wusexomugeleb.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/51529295338.pdfIn PDF document text
    • https://baglab.pl/galeria/file/libira.pdfIn PDF document text
    • https://ckmandarin.com/uploads/xubaju.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d6d283c4604---27351091100.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/safebuxuvasurezap.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/mexegumazodatuw.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/wazoxufimadapupiwujof.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/a2a610ba3e01b07bda74e029d556fbff/6447443764.pdfIn PDF document text
    • https://kristinanamaste.eu/files/71530137008.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/28c5b163e5de1e90c245e10a5a6af7ae/27125879743.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/6i6hb0vjo6gc9i2j7oqlggpm14/topugavelofavabig.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/hn2k6928k392g365c9n2649sf2/viremepewupudifod.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/74457632448.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/4944587764.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7f7b3c1bb---65487318065.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/mevaxi.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/95977429848.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16088d8b45e1cb---fesedofemolekonenel.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_off0000d515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD515 16292 bytes
SHA-256: c772d833c82d807cb3ae42326ffd9a51ce97fbfae0349fe9b68919f54fadf98c
font_01_sfnt_off0000ff6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11781 10576 bytes
SHA-256: 8ae47ce2a7fe02db068ae4826b03b6cf5b29c15901c6dfe6c5cf1e584577641d

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