Malicious PDF — malware analysis report

Static analysis result for SHA-256 acba350dd7c0aa38…

MALICIOUS

PDF

76.2 KB Created: 2021-09-20 05:27:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8db0fac3dcf00e1f28d1921aab1a721e SHA-1: 0c5c167b649ff3e6083773613b2ae044fc610e75 SHA-256: acba350dd7c0aa38cccb14ad24115958c265f3176c0673b92e5cb9b1ab950900
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated high maliciousness. The document contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content. The presence of embedded JavaScript and the 'Password-protected archive handoff' heuristic indicate the document is designed to trick users into downloading encrypted payloads, likely to evade initial security scans.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://teusz.pl/UserFiles/file/92794751631.pdf In PDF document text
    • http://1hozain.ru/files/userfiles/files/26008405433.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210902_025740.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/wefutumelofipurebe.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210920081147.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-15/20210915181829997096.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/63296604386.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/fisobusaxinej.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/murabopidatal.pdfIn PDF document text
    • http://jiji.pgo.tw/pic/uploads/files/vezumubamumisika.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/34197480974.pdfIn PDF document text
    • https://tumujerrusa.com/userfiles/38031214833.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/belufopafuxaxujeroso.pdfIn PDF document text
    • https://dhrc.in/userfiles/file/zipedumelore.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/23610215950.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/03f26981d8619f9b2317186ec2014d2e/ratogodelubogego.pdfIn PDF document text
    • https://aneri12.cz/res/file/lujireboki.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/14298838123.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9d7ab3b62---fedubebavevefetim.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/41348618665.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161445075794db---16787385742.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/38562925802.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/beriwilore.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/wutabim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=note+10+lite+how+to+screenshotPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDF 10404 bytes
SHA-256: 6e9d05a6d989af01c4c92c9b059c5322f3e2a56496b8d359671497f6760acfaf
font_02_sfnt_off0000f47a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47A 17884 bytes
SHA-256: 6eab8ebe77e8c3e23a51efe5c41c6546d98b7d4781a9d2440794a4181fb241ec

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