Malicious PDF — malware analysis report

Static analysis result for SHA-256 895f0e5eb80bd0b6…

MALICIOUS

PDF

98.5 KB Created: 2021-08-07 20:19:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b7bd5b3826d2af0ddd3068afc76efb73 SHA-1: f4650b08ed7712a1643eb95eb0b5e8f66443af76 SHA-256: 895f0e5eb80bd0b67a78230e0102686a04d3cb3eeb66f4a0d0e3668b8b18a999
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish or distribute further malware. The document body is unreadable, but the heuristic findings clearly point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://wintec-samu.hu/uploads/files/lisirito.pdf In PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/99b887a1e9afdeb9b45889e568a60513/67610479507.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/70608174818.pdfIn PDF document text
    • http://cloverdiamond.com/file/10551301387.pdfIn PDF document text
    • http://natpuedu.in/userfiles/file/98363723113.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/c8ffcb507f8028f4f7c54a07bd86a44b/61742625792.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/lofaxexirowokomofolajake.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/xerozadaxofaredirogobozo.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles//files/12903381182.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/palov.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a236d1d6935---22233813634.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/q2cbvjjvncgnj2bguie65scepf/mitubazefilugeda.pdfIn PDF document text
    • http://cutskytools.com/d/files/30184915900.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/dorogawadi.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/8bb490450e86097cb4d9bdfc20742da1/vesupujopezujokodezodiwis.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/5159523106.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d937767204e---71817929098.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/78645156f520f8cdd6bb254f60074893/96693921831.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/odjebtmr4rv7ajpl7fbd394pum/25255327559.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16074661379c84---51152161209.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/c7447122171030d01a9e1ede308d90f7/88233643062.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eaaee5263e---14715415598.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/mevinup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+do+you+get+past+the+basement+in+hello+neighbor+act+3PDF 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_006_off0001421b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1421B 18896 bytes
SHA-256: 5bc1db7a106cd95a81b540966f26846ea3e7317f436367afe4d3709f292d288b
font_00_sfnt_off0000fb53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB53 16872 bytes
SHA-256: d38f276ae315cb3ceeaa95d2657360cd69409c6b0ab802b84aaac8cf8093344b
font_01_sfnt_off00012744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12744 11564 bytes
SHA-256: 5d2698967476d6c8633b4468b4ae8d11e22ef642cf4a46cd69d6f7ed03167ecb
font_03_sfnt_off00016127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16127 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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