Malicious PDF — malware analysis report

Static analysis result for SHA-256 881a22f6bc912154…

MALICIOUS

PDF

85.7 KB Created: 2021-09-18 22:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 095e6b8c4a27524b5afd87077d276f45 SHA-1: aa24c8e0e928d84cc4e0ba4c543174eac618b7b0 SHA-256: 881a22f6bc912154bd75da694eef878b0a4c602dbf4d92a753a743fb720c2896
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of a 'download' button lure further supports a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 https://turbooto.vn/upload/files/88369070947.pdf In PDF document text
    • https://alev.az/userfiles/file/16021837831.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/9nl7e4is192ffjocvdbo6j8a2k/riwakojovevemenafonodaro.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/rewudawovijap.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/gubepap.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/tokelewokebulabiwivar.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090902492173499.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/8516a3f27935908ec9b6ad74847f756c/31085344403.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/97865184370.pdfIn PDF document text
    • http://health-bridge.in/upload/file/dinujagexadedav.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f1aac938b---bovob.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/zepoxazakajigi.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/sawiwafesujetagopesirane.pdfIn PDF document text
    • http://ilink.pl/userfiles/file/jagusosopemarivone.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426673af324---79960474665.pdfIn PDF document text
    • https://inarsindbari.org/uploads/xezofew.pdfIn PDF document text
    • https://koratspring.com/upload/file/libotem.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/79803864586.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/wisikifina.pdfIn PDF document text
    • http://th-hl.com///upload/files/sobafinalesatino.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85827800683.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/91673960350.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=top+5+fb+auto+followers+apkPDF 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_off0000e5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E1 10668 bytes
SHA-256: c9ea2969d2ebf55167199061c16c9f5857f4e0067067506c62500d8abd83500b
font_01_sfnt_off0000fe71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11683 18848 bytes
SHA-256: 1592394c2d4bf7aaa90b4a3e8ea258e4087fd726edce5d331c2d65a31492d395

Open this report in the interactive analyzer, or submit your own file for analysis.