Malicious PDF — malware analysis report

Static analysis result for SHA-256 f95f1c12ace77c09…

MALICIOUS

PDF

85.6 KB Created: 2021-09-04 23:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 64ec5d154ff812a89c64e8c5a7cca55e SHA-1: 472d56390ed8b7b1587f98323cf853f8dc65ba7b SHA-256: f95f1c12ace77c09b66ed4379982e06c9fe822e221cdf1e7ecb37baeed2d8d4e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other potentially disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall structure strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c04020e8451---59235991420.pdf In PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/lidutaxenawixoju.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/8863245926.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/33b4dff7b9726fae75c4d2cf10ef522c/rigubudu.pdfIn PDF document text
    • http://sensitiva.fi/UserFiles/File/84124012274.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/25350401285.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/mugezuw.pdfIn PDF document text
    • http://ahchala.com/img/file/manubego.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/fezirusegu.pdfIn PDF document text
    • http://charnafamily.com/clients/60216/File/89341796736.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e640aa2e4f3---49319949989.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/62215126817.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/68503321641.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/08/files/210831060834.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610fd2340d979---39137068104.pdfIn PDF document text
    • https://seerupit.dk/assens/file/52739757684.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/apsu0r83gg8tqnmqkd7vnla177/fakizomaxusokizadoj.pdfIn PDF document text
    • http://fygl.net/uploads/file/281227225582.pdfIn PDF document text
    • https://marigabung.com/contents//files/mutamujagitafejum.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/da3e4e679dd8a1ae3dedc30e6d8a3d56/52180543073.pdfIn PDF document text
    • http://sql110.com/pic/zesogikoputonat.pdfIn PDF document text
    • https://vestol.bg/files/file/jusogomozolegefovitu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=types+of+epoxy+resin+pdfPDF 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_off0000e8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CA 10364 bytes
SHA-256: 77d455d0169bee7768671013ef0920f3f6da3fac9b3e326fcb0e425d32d0974e
font_01_sfnt_off00010055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10055 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11867 18604 bytes
SHA-256: dd994ab36a5910ce8dbe937367458f095f426b87614325c5f8ea3920d2ede51d

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