Malicious PDF — malware analysis report

Static analysis result for SHA-256 e39bf9e2fc0c808d…

MALICIOUS

PDF

69.5 KB Created: 2021-09-03 06:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: edba887101f8f902b06d97abbfd47af6 SHA-1: 86ba01a748d7648131589738913d4bb66743c603 SHA-256: e39bf9e2fc0c808dca7e335b633c5ec9a3c2ff1e16cf32d16b0a2d20a69d7a45
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9130

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://vandolderskb.com/images/usr/75489243046.pdf In PDF document text
    • https://aduanaldelvalle.com/userfiles/file/65143240352.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/0f45b6cd6f2876f9adfb2568e873b218/8348677589.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/zikakaxo.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/rosegitejodugixulu.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/bekipupomimibidapanapipul.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/52399866154.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/27033561898.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160823182a8487---63721011560.pdfIn PDF document text
    • http://atraba-holding.com/userfiles/file/60365329572.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/7b6f31b2779521a53a35b949801c8421/verinixixukipobogugad.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210829052258.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/pasisejepawifebuvu.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1cd8ebf712---86382389436.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/bodikimomedakekibi.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/50a212edb7439345b32f4ffdc09a99d6/54244919004.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/mawidaxabozilatigix.pdfIn PDF document text
    • https://purefeeling8.com/data/file/28153786995.pdfIn PDF document text
    • http://ddgasul.com/userfiles/file/3212180389.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d48126944---97965544109.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/lexifufo.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da9a2c4d350---99183381643.pdfIn PDF document text
    • https://flyfinz.com/userfiles/files/fakogulupemudufus.pdfIn PDF document text
    • http://agavietnam.com/img/files/fonokitevibawuxum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=manual+functional+testing+toolsPDF link annotation
    • 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_off0000d9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CC 16828 bytes
SHA-256: cc5c084c5ae22a71df8ccea4b3deb76ff3c05987025c63700a9e9a907d839aa8

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