Malicious PDF — malware analysis report

Static analysis result for SHA-256 39e63d0e72786b08…

MALICIOUS

PDF

83.7 KB Created: 2021-09-03 01:33:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ac86c9158df1cb84d6267d7e648b7f9b SHA-1: 333281c83f3d0e86793a14f361ca34ce5c2da84a SHA-256: 39e63d0e72786b08f167cca4dbe10cf113844e55e40a17fd587290ac3c8027b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

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://pixomot.ru/uplcv?utm_term=cambridge+comprehension+worksheets+for+5th+grade PDF link annotation
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c3675fbb8---nenumasomitaduzof.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/wesawedomurom.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609717d149904---72350663212.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16120ccce151b9---xesetasujiko.pdfIn PDF document text
    • http://gtshotel.it/images/file/pemixududimizimovi.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/mokazole.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/7898404985.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16123559234591---wapuvobedotowuzoruti.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210628160141.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/b7af5f5139669e052a3ae9a1542161d0/fatowekoxorufo.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/koxuvipupafuf.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/38339167052.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/708b9539df7b492aaa56eecfe10e7f77/gilenenagukodadapexuri.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210802_C1F104784E991B04.pdfIn PDF document text
    • http://gptools.net/userfiles/file/63158611130.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/xalikidotutatiketefadup.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/f46e40b82c31a1b85a1391990062dbb8/popor.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a6089ea3a2e---85894372251.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/nojuwom.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/mulozilam.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/wakemiwe.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa64c2e5f2---36857747146.pdfIn PDF document text
    • 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_off0000e2bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BC 11504 bytes
SHA-256: 42e192fbc9127dabfcaaf7a54c059fcb0686429987270cb0d4183ce4f7866f86
font_01_sfnt_off0000fd78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD78 17200 bytes
SHA-256: f582e75c05d4897a667b17ff889e9856ab0f2cd42750d55e9dbed5e0d4801acd
font_02_sfnt_off00012a0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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