Malicious PDF — malware analysis report

Static analysis result for SHA-256 dabe9eda32a43cb3…

MALICIOUS

PDF

82.7 KB Created: 2021-09-13 01:42:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e22c174f73c1468f2edb1f4c2de6d404 SHA-1: 4bddd04d9a189a9b7d058bdc38f5ba248af0c5c5 SHA-256: dabe9eda32a43cb3515ac1b3e9f610ed687c5e3379d7b5e1ce6a6c562d9a86f1
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but serving as a vessel for the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://essaidafm.com/uploads/FCK_files/file/37783638041.pdf In PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210901_E6226287307E4D62.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e40a3cab4---4388464754.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/bitotefulekewisori.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/p7lvd3i1eg5sb1nspf6o5gh05g/lofugosex.pdfIn PDF document text
    • http://519pf.com/userfiles/files/kasujupitodajagufi.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac44c424bd---ruriwenukimatupidapefog.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/71533220653.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132c4915789d---vinagiridabifasabezib.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/dalifeduxisunigari.pdfIn PDF document text
    • http://jumpstart.mobi/ckfinder/userfiles/files/ragipetixuzupatilomam.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/91371171126.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/35119180409.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/33896541014.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/68571980646.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/wefodowokakefegegupa.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/tifovona.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/piwudukabejudakozewik.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/f29aaf6a49d32dcc41029ef6ea93c95e/sejokakufetew.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/gitatuxezupilelokivixe.pdfIn PDF document text
    • https://anandalaya.in/resources/file/xejuraguraleta.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613565a0abaf3---25651979597.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/34953009224.pdfIn PDF document text
    • http://floridare.ru/app/webroot/img/uploads/file/183403_61218627579.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=miracast+app+for+mi+tv+4aPDF 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_off0000dd90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD90 10496 bytes
SHA-256: b1cbdbc6217dfbf8880dda8df10c26a37ef06f22c12eb39a95a31dec355ae276
font_01_sfnt_off0000f58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58F 18432 bytes
SHA-256: d3db6ee992befe9681dee39f5968580793abb25d00f81b2180173c2e53a63e6e
font_02_sfnt_off00012563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12563 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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