Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aba85df7646cb79…

MALICIOUS

PDF

82.7 KB Created: 2021-07-19 16:50:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e63f96d7b0b18a6393888b95922cb667 SHA-1: d45da7f3b025b6bcfb983bccf8df5469e0db86ce SHA-256: 1aba85df7646cb799573c267b4c92a508b36ce7dda0e7f7486090250ebd44d4d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript and a link farm pointing to multiple disposable hosting domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript, though not fully analyzed due to obfuscation, is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://naturallabs.fr/userfiles/file/22532815375.pdf In PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/d8ca85ada2e6d881b05b231e81a134da/gonebofigikaravelul.pdfIn PDF document text
    • http://kag.fr/userfiles/file/35418046978.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/48621292606.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/suzusajofukewoxusofidasog.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/835701abb4b73cd7cd6a4078ed45d4e5/60597428984.pdfIn PDF document text
    • http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/lewasiponugulizexa.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/8850d7086583a8faf325209f488297c4/zuwas.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/98857782592.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210610020539149785ms2t8v.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/496a039fc3234eb681e6e041265b01b1/totivimirelok.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/93102584548.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210619_1D72C6A264939705.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608413d2b2bec---mezutuvotagi.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7cc95a25b---pejanatuseselozorefer.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/qrbegdurht4dg4vhdn1qa6lr7u/nibuzixatogore.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/qbo4o48bsd9pfakehcnrmjmucg/zivokixositiga.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b310a1e620d---78489601731.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb5b73c623---jifibadif.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce39ec589a---3178873435.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/sojejisimizenitusuludemi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=anti+sex+meaningPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969cdae5a28---bevota.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_off0000e0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AB 17516 bytes
SHA-256: 7d4b6ae08538757ff42f31643971a85ef0712bbbfc8f836089e00e5b827ed069
font_01_sfnt_off00010e94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E94 10268 bytes
SHA-256: a96a311f8417b68344c6d55fd28be2d5cf0697f4b5ec012e29dd869643439396
font_02_sfnt_off000125bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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