Malicious PDF — malware analysis report

Static analysis result for SHA-256 90af538d65031563…

MALICIOUS

PDF

78.6 KB Created: 2021-09-18 08:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2449946052b78c6e519c7d73723c76b0 SHA-1: 49762c23b97fbdb00bc17174dbb4439b347597c0 SHA-256: 90af538d650315639a43afc751ff5a5f86c633f1493828030aebc3f138791ba2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, some of which appear to be compromised or disposable hosting, suggesting an attempt to distribute malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download an archive and provides a password, a common tactic to bypass gateway security. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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://chongthamnguoc.vn/img/files/jipobudibimadi.pdf In PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d75132c040---65809070918.pdfIn PDF document text
    • https://huanghecables.com/d/files/xobufulexa.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/xowigivule.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/salijizekebokugunidij.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/linorubejisugozidowitofa.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/17196592450.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/madino.pdfIn PDF document text
    • http://pi-consulting.ch/download/53724465010.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/449412cfc4a6f166c190942ef08f8b60/xogapovemilep.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/vedosowajudufuvadenud.pdfIn PDF document text
    • http://kbchina.de/upload/zobogotufelusapij.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/76114155140.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/kuwidezejo.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/45631074495.pdfIn PDF document text
    • http://wonikqnc.com/upload/editor/file/1631238536.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/damamamuri.pdfIn PDF document text
    • http://kmjmt.com/news/upload/file/21090909461765639468hiw4.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/72410362271.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c8f843ce5---34019636992.pdfIn PDF document text
    • https://dampinggame.com/calisma2/files/uploads/letije.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/tatojiviloferulekawojuke.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/4i55qn929nf9vuihmu7pakrcsv/19669914964.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/wivukazubavamovozo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=recover+unlock+pattern+androidPDF 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_off0000cf07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF07 17432 bytes
SHA-256: b1b45a16501d99657017a849708ac022f4c8c97ac70ccdf32d44c8c309a1e9c7
font_01_sfnt_off0000fc11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC11 10640 bytes
SHA-256: 1b208bb571295d0f62991720463afac64d6b4f1ac6045ccb0cbc7a2b2c857931
font_02_sfnt_off0001148b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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