Malicious PDF — malware analysis report

Static analysis result for SHA-256 99322ba0600cbcae…

MALICIOUS

PDF

77.2 KB Created: 2021-09-19 01:10:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f37d99642019c6dc1b69782d25cfe84f SHA-1: efad7c61c17019721b54be1487257693774f79e7 SHA-256: 99322ba0600cbcae0774bd4f66378daa52d857f66d66330583f126462e30c93b
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. The presence of a 'Password-protected archive handoff' heuristic suggests the document is designed to trick users into believing they need a password to access an archive, a common tactic to bypass gateway security. Multiple URLs point to compromised CMS uploads and disposable hosting, further supporting a malicious distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://visualmotion.nl/uploads/file/nalalanilob.pdf In PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/xedudovejituwume.pdfIn PDF document text
    • https://nordiskvillaventilation.dk/userfiles/file/83855284615.pdfIn PDF document text
    • https://emailchopper.rockeit.com/userfiles/file/fifop.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614659dc35e90---2409725264.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/gobidoxite.pdfIn PDF document text
    • http://szjg.hu/images/file/58651320703.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-9/file/76898278966.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/xojumixuxowulapat.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/23338440911.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/40636164120.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/29923322358.pdfIn PDF document text
    • https://producto.works/userfiles/file/rigaralobedixutinar.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/66833292113.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/tejegalinig.pdfIn PDF document text
    • https://bfull.ru/uploads/files/60414190352.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/vojere.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/1370688686.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/161341d428caab---94516581228.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/35077843032.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/dunizavolaxijoxigunubu.pdfIn PDF document text
    • http://runo34.ru/attachments/file/simapifelorikidejeraped.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f789962388---87536269468.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/vageniletubajev.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/zorixusugakigedajofagaxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=toca+lab+elements+free+downloadPDF 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_off0000c98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98D 10732 bytes
SHA-256: dc056d55cd7253c3f2e2351f6cda82138fd4e537c516ee87ffdf5c6ade44aaf3
font_01_sfnt_off0000e24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5C 17376 bytes
SHA-256: 799e10c87131385049bd3fb34d9d1e41d71b38848582c42b4dadbd709c533dc4

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