Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ca9a0c23e2fd7ad…

MALICIOUS

PDF

77.6 KB Created: 2021-10-16 01:18:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5604cb7daf5b1a4aea64074827b9c41c SHA-1: 17bf4af62d75d3fe425bb9681ea501901bf25b0f SHA-256: 2ca9a0c23e2fd7adcea99abb7a6ae490e6bd670ea226a3eea6e88a0427ee3edb
156 Risk Score

Malware Insights

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

The PDF contains a significant number of links, many pointing to compromised or disposable domains, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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
  • 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://kfnmsz.com/upfolder/e/files/20211016053730.pdf In PDF document text
    • http://jun-travel.com/userfiles/file/zoxofixufepuz.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/tizizi.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/b3052707c33390b27091e43dc8e0df7a/76935627009.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/zitefutor.pdfIn PDF document text
    • http://tfe-design.dk/userfiles/file/98998886935.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/89633887644.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/38216312005.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/7a7faecdacefedb309f7d8bf5c4da822/sarewinoluketiwijowaj.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/sobifekexejetawililug.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/70902068512.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c1e2ace32---pevidozis.pdfIn PDF document text
    • http://dgkno.cn/upload/jutezagumizo.pdfIn PDF document text
    • http://lscapital.it/images/file/62467590860.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/nebokodugujekevi.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161621bec7845d---rebefomagewodurafa.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/28567996152.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/1789589539.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ae609njhg86daclq5ge69dob53/33826742798.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/bewozobotafetedenifufo.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/jekolabesajumom.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/jenorefetedefes.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/nipofi.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/EqozwcbAC44/uplcv?utm_term=angular+reactive+forms+confirm+password+validationPDF 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_off0000c88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC88F 17460 bytes
SHA-256: 2c42488b1129bf410f9bbcf6df57b8f5f6b94a3ebcc5907caef7922080f5dbc5
font_01_sfnt_off0000f6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010eb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB9 11196 bytes
SHA-256: d3fc7608769e121e54463432c7154033243436b4fad4be0a0ec1a74e95191458

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