Malicious PDF — malware analysis report

Static analysis result for SHA-256 814cfd0c19256554…

MALICIOUS

PDF

84.4 KB Created: 2021-08-10 06:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: ca87d1d4025a42c0530194a1e8b0bfea SHA-1: 94625316374e85d9a72bd31a993ecc88c63f34e0 SHA-256: 814cfd0c19256554d5591f82e3adbe5500ddeb9a586c48770de5ce01c28d00d0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest this PDF is a phishing or malware distribution vehicle. The embedded JavaScript likely facilitates the redirection or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://areicon.com/images/file/88726425254.pdf In PDF document text
    • https://everestart.com/images/stories/file/93424573356.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/8120451395.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075d9eec6b1f---94585380032.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/guvuzobibizukubino.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/89918145597.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1143c2cfcf---41592265479.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/79457772645.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/u44psorbaf2utmin9k2vgfhhot/binovisemiraguxedol.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/mixoborex.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/67507384245.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1fa905cf7e---pukivur.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/781d9b46335584cde22af5df4ebbaa39/56591964469.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/26233260724.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766dffdf38c---wasokunifuxopovuba.pdfIn PDF document text
    • http://ud2-140.com/files/parolekewafibop.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/hr0p9ne0vtejgqgj20sjsc40la/nises.pdfIn PDF document text
    • http://clingac.com/d/files/lexazasugajuvelulaje.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/73216637121.pdfIn PDF document text
    • http://m4krichmond.org/clients/3/3b/3bf4c986be49c21931b3574e72fd8103/File/lifibisibamibomuvo.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/muruxozap.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/5f384dc30234d58210becc40ba07a4cc/gamokozepajew.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a14bf07994c---manulotofesunadirol.pdfIn PDF document text
    • http://asfalon.com/__files/file/20797859810.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=bioenergetica+lowen+libro+pdfPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAB 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_01_sfnt_off0000e227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE227 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3E 10908 bytes
SHA-256: d7ab5b314fa7e811b4cbf7bcaedad68d1d1dbfa704f503d5eaef90e4ddf15c77
font_03_sfnt_off0001133e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1133E 18448 bytes
SHA-256: f4b4f600119096b998bc72c60e012f48a686d0ebe61d9b19d4995d0c489d0308

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