Malicious PDF — malware analysis report

Static analysis result for SHA-256 45efc2ba6d985658…

MALICIOUS

PDF

77.6 KB Created: 2021-09-16 10:35:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9e7648d16fe45c029283316e52967816 SHA-1: 1f158963cde03f7d1e77ff7358f2874cca1fc82b SHA-256: 45efc2ba6d9856582601d5250ba02a6d499018ed8eee6d1bef40ec5460c9161b
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent, likely phishing or malware distribution. The presence of external URI heuristics further supports the attack pattern of directing users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4750

Heuristics 5

  • 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
  • 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://crewmak.ru/uplcv?utm_term=control+one+android+device+from+another PDF link annotation
    • http://flooroverstock.com/admin/userfiles/file/wazufujizusozevas.pdfIn PDF document text
    • http://hanarotalk.com/userfiles/file///joboregazeje.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/puravanejexodu.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/xaburoveledadegem.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/12338737647.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/develodujapazugetafop.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/nebamewutufavasajadif.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/efr699qkqa09rbgg02e2i62ufj/78678500931.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/28597109604.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/404362361.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/8130149931.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/90320661285.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/43179436245.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/netipafusoxulafu.pdfIn PDF document text
    • http://dhf-china.com/d/files/xalajebuselivun.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/b80f3d2c42db1102046e39dfdfd12ccc/nivavonugejexonokozopibax.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/62680502615.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/k16jkaes09tp8ts5oaqoqopunb/56737748936.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16142afe77ed88---girufuji.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/79131328119.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/1630508177463.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/wateram.pdfIn PDF document text
    • https://mashura.co/userfiles/files/38934080407.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_off0000ee5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5A 17668 bytes
SHA-256: 981611379596f8a03ba9061d725376e96d0752a45b612553653c71caa28e55a5
font_01_sfnt_off00011c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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