Malicious PDF — malware analysis report

Static analysis result for SHA-256 f26206d0bb55c4a1…

MALICIOUS

PDF

79.6 KB Created: 2021-09-10 12:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 73436a9714f0d7c2ab8cc44317e932ee SHA-1: 46abf059d85db23a9926aaa5a4d2ced6bb349053 SHA-256: f26206d0bb55c4a11d70b53a75d56888800a8b435ccfb7feadb6236d5d04534a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://everestart.com/images/stories/file/figobagijuvik.pdf In PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161367ffcab863---52163094142.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132309fc55e7---tifomimeponoxovo.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/weremowegosepini.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090309172773499.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/gubixiw.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/f407f96173794bca710c40e253b886e8/sosixetipofigojutizime.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/87348889945.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/sesis.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8409a3b56---wowubuzu.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210909052702199.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63612445928.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/34516010046.pdfIn PDF document text
    • http://szm.hu/userfiles/file/sufelinujufasofixisip.pdfIn PDF document text
    • https://masihpt2.com/contents/files/mupusola.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/sixovuvakamu.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5aa014758---28729387428.pdfIn PDF document text
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/55864701578.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/27830695799.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/minarurofelotadurile.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/49767356000.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/wimusajosilijujibivaxor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=redmi+note+10+bd+price+in+bangladeshPDF 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_off0000cbf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF5 19360 bytes
SHA-256: 4fbc15e71f066879aadc62f68ee599528beb77c655895ff8a515da9cd36dfc36
font_01_sfnt_off0000fe90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE90 11320 bytes
SHA-256: 181306461935f1f472d2189965e75f9fea4796d7d7d413fb5862119a512ac44f
font_02_sfnt_off0001188b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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