Malicious PDF — malware analysis report

Static analysis result for SHA-256 d77eda27b404b0a7…

MALICIOUS

PDF

83.3 KB Created: 2021-09-22 21:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e3d6401d5b2a4db0ff145a2689eefe7c SHA-1: 638af1e32c93f8627e979ee02191d8b23b229424 SHA-256: d77eda27b404b0a7ab81ec0631c80c3d2c9a58b582f42780dd7d2958b139995c
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with several URLs pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to distribute or obscure malicious content. The presence of multiple external URIs and the nature of the link farm indicate a phishing or SEO manipulation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://successalpha.team/upload/files/58852809093.pdf
    • http://www.electricman.in/demo/frontend/web/uploads/files/93975601910.pdf
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/78466750571.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/87a5539f557b239d8beb8d6b1c76f257/79160231956.pdf
    • http://pivotal-technologies.com/userfiles/file/65557727238.pdf
    • https://abbma.in/admin/uploads/file/84330025000.pdf
    • http://moderncarrent.com/user_img/files/58935693800.pdf
    • https://avistravel.ro/userfiles/file/venixefefu.pdf
    • https://bacsionline.net/userfiles/file/jitenilaxovilo.pdf
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/rolomijegoxelulaxige.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1614921e2e8608---jimufesugurose.pdf
    • http://thecargonepal.com/userfiles/file/zevinozob.pdf
    • http://odnoklassniki-files.ru/images/uploads/files/lujuxafi.pdf
    • http://gioiacompany.net/images/upload/file/pewari.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613197e35170e---nivevo.pdf
    • http://bonfiremadigan.com/uploads/fckeditor/file/76372586247.pdf
    • http://easyreturn.store/userfiles/file/tojifotoxafunirevobo.pdf
    • https://nhabe.com.vn/ckfinder/userfiles/files/59319940121.pdf
    • http://www.prieteniitehnicii.ro/documente/file/tekopalixekipewiditilod.pdf
    • http://studiosimonepantaleo.it/userfiles/files/zirowobusur.pdf
    • http://fese.in/ienupdimages/images/files/4138484017.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/4dm8m63pud5js4m4bpjl2ufih1/28924605078.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=tekkit+modpack+mod+list
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e305.bin
2b672b3d34885f88dec2bc8b4e49f323e210e6916ade0abe55d6b5772083dc47
pdf-font-stream PDF embedded font (sfnt) at offset 0xE305 17360 bytes
font_01_sfnt_off00010faa.bin
1ad8e103556da01227e208e49986d3ea380f11d0d6da781eaa793ebb360ca4a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAA 10524 bytes
font_02_sfnt_off000127ae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x127AE 16792 bytes