Malicious PDF — malware analysis report

Static analysis result for SHA-256 95900c416e251278…

MALICIOUS

PDF

72.5 KB Created: 2021-09-19 21:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 968697a082d01a96902c2dd2b55eb301 SHA-1: bf9400c4a9e35a58b15a0bd5c5c493afbb846911 SHA-256: 95900c416e25127807134190e89f519927592b21e522cf50886d954ecb6fc07d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous external links strongly suggests an attempt to redirect the user to malicious sites.

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://j-line.ca/fck_upload/file/vilukoraramizuguvafunot.pdf In PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/53914588574.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613352e86b5ce---jaderozetigepabutugapewa.pdfIn PDF document text
    • http://fullx.net/files/kinabuzibikiv.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/13567102187.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/bemokekinokilikenawojiw.pdfIn PDF document text
    • https://estoniapools.com/contents/files/77448041191.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210919073004.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/netarolukumusolorubatux.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210918022948.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/48957483764.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/gutidamez.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/jerotosuvepiposibutofome.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/vojijiniralowavudefa.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/ha3jrd9rjgaad17hri79hbkkd3/nerozonolosunupufuwi.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/jimisij.pdfIn PDF document text
    • https://maviet.vn/upload/files/70505684177.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/2ced2aaecd4dbf41591a8173d74f2748/dukaz.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/xesabekiluvenanibosag.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/dirinofizikog.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/39645524017.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/pakenilarorug.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/paxitapew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=convert+epub+ke+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_off0000bb5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB5B 10452 bytes
SHA-256: 637e79651fd826503c8d8da33529d2bd5e2f3a9ff9cd0d9ca41b5ace027fddec
font_01_sfnt_off0000d303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD303 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB15 16048 bytes
SHA-256: 757c5c730efa7735980b821ec2fa0e86756482ab1aa92da9f5cb7d048863df4d