Malicious PDF — malware analysis report

Static analysis result for SHA-256 e40a59e72b988b23…

MALICIOUS

PDF

80.1 KB Created: 2021-09-04 20:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8073b8c7ca2277cd38c1346afacadf3f SHA-1: 312c666683dcf5c3186f40300db6ef13f706ffe6 SHA-256: e40a59e72b988b2341a7fcdf5a52f0a177fce25acd0f2dcf30a1c6e38fce954c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to exploit vulnerabilities or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://reelproductionshd.com/userfiles/file/zutukupigalosewoja.pdf In PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853939e131b---pugiz.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/of3n0vj61p0d947d3gg22iik9d/wesavivo.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/98562671740.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/48296076385.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/23257903857.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ab00150c0.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/bh6m3i5pcqa2slbp51oab2qrk4/96015891004.pdfIn PDF document text
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/gorefoliruve.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/jevemeporokifovefu.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d433ac0104---pisir.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/10b6415d266bc61a3d9f5c2941612354.pdfIn PDF document text
    • https://shunnasato.com/57728898682.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/juxifasiberop.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/rozala.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/72974982210.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079977c20ad7---23151543013.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/f852e9081c007fc550a29a1c55357e3f/2568624922.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f3b45e77e---18371560674.pdfIn PDF document text
    • http://muszempilla.com/files/file/rulefebawalubapifikel.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/kufanojopajegipew.pdfIn PDF document text
    • https://www.aeap.com.br/ckfinder/userfiles/files/21507270163.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/nazodirudiwotepumi.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/xujapafisawupukamosotut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=eye+chart+test+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_off0000d6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF14 10452 bytes
SHA-256: e161d93874e0eb961b0c7a9ee4c8ccefa787e1bdf05f664fd3d1366cf2349c5e
font_02_sfnt_off000106f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F7 17160 bytes
SHA-256: 0a4610866da7e370b101310205f35727147852bc9bea50c8ddc3278f9597aa4e

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