Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d1597af597d2c29…

MALICIOUS

PDF

71.4 KB Created: 2021-09-24 23:04:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: c2210506f2ceb52ace376a46411125ea SHA-1: ecbe7ede4d455019f57944f5ab8eead8cedd005b SHA-256: 5d1597af597d2c2968f3580b64f67e8ffb7acb8fc12f78ea9de70e808c8de9d0
196 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The heuristic 'SE_LOLBIN_RUN_COMMAND' also indicates the presence of suspicious command sequences within the document text, suggesting an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://csc021.com/userfiles/file/20210914171242_sb0z4g.pdf In PDF document text
    • https://ceccardolj.ro/userfiles/file/sijikuvorije.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/bonexejurejenafovumolores.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/56578038210.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/rozetarovirenigawun.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/67223609998.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/5e1d0c8bd8b2cc5a5d0f90b3b8a12d3b/34963707189.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/nusekumolujuri.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/7lq17qpm920afhnu0dl1ftr4t7/6531903524.pdfIn PDF document text
    • https://grandhotelushba.com/userfiles/file/ritudazolilizatajag.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/likesapimetivisasomoxum.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210917094200111.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210910000624.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/94606607102.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/38379778092.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/90430030043.pdfIn macro / runtime command snippet
    • https://hospvetcentral.pt/site/upload/file/79385180738.pdfIn macro / runtime command snippet
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c437d91908---bepuzoketowesafe.pdfIn PDF document text
    • https://successalpha.team/upload/files/kopudukafemelinugat.pdfIn PDF document text
    • http://z500.si/files/10760612619.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/72023694090.pdfIn PDF document text
    • http://nmways.com/uploaIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=best+hd+iptv+apk+download+freePDF 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_off0000af3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF3E 10892 bytes
SHA-256: b2dae99d209fafc5aaeb83cea6acc949b3b4b6338ae09db58060fc0de5be75f5
font_01_sfnt_off0000c879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC879 18328 bytes
SHA-256: 83c122bdf43167c4ec46e58716b81a48a282112f3a13f7bad79dde1bb4b7a0b5
font_02_sfnt_off0000f6cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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