Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e8e06e6b4b326e5…

MALICIOUS

PDF

84.0 KB Created: 2021-06-30 01:06:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fe58b7161007aef27346f4a6433f715c SHA-1: ef6e4a3f2dd9231dfb2d15313ed193f621837e4d SHA-256: 9e8e06e6b4b326e5a5103d1756ff521e22fd72a99b34759d2aeb4aff22a805af
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple compromised WordPress upload sites and disposable hosting domains. The embedded URLs suggest an attempt to redirect users to potentially malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://karapinarinsaat.net/userfiles/upload/file/75524143661.pdf In PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/hofoc16c0nlneh8cl2dennoh21/pakabagimatiwaxo.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/fopovelebatopuwuta.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/df1d39ebbe8e840dfdd42e6879f31c78/54595031329.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/5e76611a3d0ecb84be69c6d826872e49/rufupipevu.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/7349afb88f4b631208074b93b19245b8/39226367420.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/naduguvizuduxanenibuz.pdfIn PDF document text
    • http://cosmic-kino.ru/sadm_files/fanolofazikajikizevaruz.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210630050757_7wm8vp.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/78e89af48d776e8bbe4dff933db0ed03/1173421280.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/20468526599.pdfIn PDF document text
    • http://mousike.it/img_ins/files/44116311165.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/kkvqqru862pnfra5njo89mkr53/vonem.pdfIn PDF document text
    • https://ahha.az/userfiles/file/jixezukewikibatukidi.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1622433363.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/40535256423.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945bc9b361a---75653429370.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/gh922ce9csvd0g1imshncqtt7c/89882094001.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/a828dbf527b4af8b25d5e686e5318f1a/49282045575.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/81458659003.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160847ffef0df1---jolifixugevezel.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607840607be6e---49514458702.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16083671138742---40307525656.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160834bc4772ae---rabibagutirumupa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=questions+with+past+tensePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00010dd3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10DD3 17932 bytes
SHA-256: 656ee215669e4f9eb0ee3b10f6f20dd8547f30cc5027f4596b85253b46b02265
font_00_sfnt_off0000c9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CF 16960 bytes
SHA-256: 4b7f558e7c086411051bb495e879405584d46dafee85fc470711c35d87500daf
font_01_sfnt_off0000f5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FA 10448 bytes
SHA-256: ecab4f7a195f84f839e0307fd569b684fb48b57a9dd8e74f0639bdf6b552bc7c
font_03_sfnt_off00012a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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