Malicious PDF — malware analysis report

Static analysis result for SHA-256 835cb1827e672f3e…

MALICIOUS

PDF

85.0 KB Created: 2021-09-06 04:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 87a08b16eca3b2b9a4de4b8b2173f59e SHA-1: a37b662885f03c44a2854e1f0c7754c34c03d2a9 SHA-256: 835cb1827e672f3e4d9b01cae65ab0c969f460bbdb672673c994931376a5c776
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised CMS uploads or hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to distributing further malware or directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://firstcuwire.com/file_media/file_image/file/72593628523.pdf In PDF document text
    • http://italy-ex.com/images/blog/file/safokupujiwulikifekup.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c659fe7bf4b---811250821.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/89888674392.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/72717021270.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b35db8079---90390377737.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/dejinuxefa.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a90e87b1d1c---vofetujimakoripifapoto.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/49475593202.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/9824389336.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/tonesupolof.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/32478976887.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/7475726791.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/29648825266.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160844f4bd0f22---joduwuxugij.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/98264861112.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/kozotidaribesazinok.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/xupuf.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/64428451846.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/90421361805.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776a099f8ef---78946577319.pdfIn PDF document text
    • http://hudsonohiohighschoolclassof1980.net/clients/7/7d/7d4b1ad73701457990394555a34ab01f/File/gesazipajeridexivefapadox.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/38237431628.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=ocean+of+pdf+website+shut+downPDF 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_off0000e5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E8 10924 bytes
SHA-256: 7c8b77b6e848af2d5fe5607aff6aab98804111d27d7424dc2491f9c2708d75ca
font_01_sfnt_off0000ff0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001171d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171D 17544 bytes
SHA-256: facd156403de1699a69a4f316504782c48a2af3488c36d3802e1eafa750e01cd

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