Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7bcc0534739ea82…

MALICIOUS

PDF

63.7 KB Created: 2021-09-28 16:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 323f6a7172dd981e57f80b8d2460d10d SHA-1: 7318b51a084d9a473691d8c4334df1636fdf6b29 SHA-256: c7bcc0534739ea828d76008684eaa98759380aec562907e27272862bbd9bb2ae
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting domains, suggesting a link farm designed to distribute malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan', indicating a phishing or trojan distribution intent. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is used as a lure to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4625

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://krisoc.ru/uplcv?utm_term=computer+game+download+windows+7 PDF link annotation
    • http://www.specemc.ru/upload/files/notomaviruzog.pdfIn PDF document text
    • https://keyseries.us/userfiles/file/89693264256.pdfIn PDF document text
    • http://thueotodn.com/uploads/image/files/sutuxotonimupajegopamujex.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/24575501909.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614e347880477---15046920120.pdfIn PDF document text
    • https://etadelloro.it/images/file/28646336546.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/qg70dnln80f0r1j15eapemrsp2/koguxekimozukopanit.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/nurunibobora.pdfIn PDF document text
    • http://orthodoxnews.us/file/bedepaduwone.pdfIn PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/61907835923.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/87669727913.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/80193161358.pdfIn PDF document text
    • http://sz-frp.com/pic/20210927051613837.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/51310419604.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151eacb7df7f---powajevoxilifinar.pdfIn PDF document text
    • http://skmsm.com/userData/board/file/11237234989.pdfIn PDF document text
    • http://wenxuezj.com/images/File/pufomupogifatiromopagu.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16141ac26c0a88---34031609431.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/13522938413.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/daxoguwavedel.pdfIn PDF document text
    • https://labelmarket.pl/data/file/nebebanaropeposapen.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/napadikifefo.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/tepugovudulixepenezi.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F0 15640 bytes
SHA-256: 803a1176e550cd5aa1da18067c57ac2c92b0be6c71eb3a1ad3374e4dc5e9e53d
font_01_sfnt_off0000d85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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