Malicious PDF — malware analysis report

Static analysis result for SHA-256 88e6f210f9c27210…

MALICIOUS

PDF

98.2 KB Created: 2021-06-30 04:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d3ba630109d5f26a1cb191e410ae1b61 SHA-1: 91ac323a413e5aedca8a5c05d375ee040679f1cf SHA-256: 88e6f210f9c27210347d763cfb9bba420834940af147cac14bf0dd48554e8c62
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users. The heuristic 'SE_INVOICE_LURE' indicates the document may be disguised as an invoice or payment request to trick the user into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://loveforlungs.com/clients/a/a9/a9a80f3a93b7553e0860ec1960497db0/File/savumixipafu.pdf In PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088907fc4f13---11628715135.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1608d23b299310---43307026404.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d28466ccbc---35640498843.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/48008874689.pdfIn PDF document text
    • http://zionhillfirstbaptistchurch.com/clients/73368/File/jenalitidaduzugib.pdfIn PDF document text
    • http://capital96.com/userfiles/file/kaketi.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/nokemulidisanixiluxas.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/mavexuxelal.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/29918450040.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/pabakarezog.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/xetujasuluvidapo.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/woravasurukubobiruke.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/cjqq7q96ksgop3ulmne7bvpmr7/62727435556.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f4a6eaa78---kubavupawamowosufifero.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210625105808.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/9d8f19c0e1b242693977797980c50fdc/kisinebuwepupewovexukixo.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ae458ca8c25---91335040376.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/948ed81b3040c768a71373c1e6e6ec60/vopowifomokoxab.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/78910189695.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/8ce5fff0dad630230e317182aad490ce/32668480992.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae8be9b57c---33673387047.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/79480090960.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=certified+mail+canadaPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D5 16864 bytes
SHA-256: 2289f31a875c8ef3eac6376a1f30920ba8b3a3013bbb6d14dd0eeebf5bac9b7e
font_01_sfnt_off00011b0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13323 10380 bytes
SHA-256: 5dfe934119c11904aea5931ca11af1526f7a03c156e9270dcf57924869815a4b
font_03_sfnt_off00014a90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A90 19212 bytes
SHA-256: 06e1160a513ef291d17c9bf15c8f0b895db0a809adb9211ae5b236283ce59bbb