Malicious PDF — malware analysis report

Static analysis result for SHA-256 38477f97b32e82f9…

MALICIOUS

PDF

76.2 KB Created: 2021-09-19 02:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c123dc97958963fb55fa25797cbabaf8 SHA-1: 03a72a144c91c286c1a0d531eb407a7f1171c2d6 SHA-256: 38477f97b32e82f95009eb8499a2669c1b2b4d4a47ade7cd65f91342f3949768
154 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 or disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. The presence of external URI heuristics and link farm indicators further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7568

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=crop+pictures+on+android PDF link annotation
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/dozewegix.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/wudutikutuxevejumupulenin.pdfIn PDF document text
    • https://birotex.rs/images/files/38416223652.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/vurivosixifiwupef.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16317838562468.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/zadodulob.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/rebuz.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/witalabewipokapofu.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342ce0501cc---83326068991.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/78466399562.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/sabubojajil.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109101533038409.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/famoxijanululamo.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/74334603239.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161371eb8e4d16---51096576359.pdfIn PDF document text
    • http://sakem.org/userfiles/files/51369830041.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/rks1jqbrfn6qtrnhkarl6k25aj/xejubominugepunoliluvama.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16137c0ed63f3d---xazor.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/taxunuwekapo.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/guwupurefifibu.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/zumuvelawikadorakekevug.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b53b9b59b---wepapinorufenoka.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/63913172866.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/kajekofuxovugibomaxew.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33C 18804 bytes
SHA-256: 44d952c070eb6b4f6f4d664901f07d2c144817da00b795d145d4ee7c6b0f1f94

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