Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec2864103ca4b06f…

MALICIOUS

PDF

76.4 KB Created: 2021-09-19 08:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2632dc5db08f15faf4b51e32f81fc926 SHA-1: 04286d0e4dd8fb6b00c663a9b82eb16b498cc970 SHA-256: ec2864103ca4b06f5da8725323513ac3917aa20bc047532c49239deecbaf4272
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file 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 pointing to compromised CMS uploads and disposable hosting, with embedded URLs likely intended to redirect users to malicious sites. No scripts were extracted, but the overall structure and URL targets suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://phayaotechno.com/UserFiles/File/8569480452.pdf In PDF document text
    • http://chromowane.com/userfiles/file/5388094763.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/91040752838.pdfIn PDF document text
    • http://zzlhlt.com/userfiles/file/LianMeng202109172316037657.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380a47ec158---nukaxegof.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109011505421393.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/88904419825.pdfIn PDF document text
    • https://vpmemorial.net/images/file/petet.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/nimaxuziba.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/lobejuzugebalofavotupebe.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/runufexipig.pdfIn PDF document text
    • http://ukrfirework.com/images/file/74595552513.pdfIn PDF document text
    • http://jsjxh.org/filespath/files/20210917085716.pdfIn macro / runtime command snippet
    • https://censcakmu.org/board/file/files/mugifitefepupudojirisuzam.pdfIn macro / runtime command snippet
    • https://natyabio.com/uploadfiles/83763900541.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140450f93721---woranawawitade.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/62176162795.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161395502c7297---buzuxur.pdfIn PDF document text
    • http://pinxedien.net/upload/files/fuvetetozusuna.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/likexetozizut.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/39203512608.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/givimerinutikes.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/jogavolefolu.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/bozinibaxutixalizadu.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/76686621356.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/50115566526.pdfIn PDF document text
    • http://ukrfirework.com/In macro / runtime command snippet
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+create+icons+for+android+applicationsPDF 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_off0000c61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC61D 17516 bytes
SHA-256: 7b858a75f7011570bb479bd0c618cc0ee93788bb68411a9781472bdbb20746e2
font_01_sfnt_off0000f348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF348 10688 bytes
SHA-256: d6133579cbb32ee4fc470c7db7e190c2334ae120dcfb3fb487a686badebe1e78
font_02_sfnt_off00010be8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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