Malicious PDF — malware analysis report

Static analysis result for SHA-256 cebbd1408cade2a0…

MALICIOUS

PDF

80.2 KB Created: 2021-09-12 07:02:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f45546c340afd64013be3134869a6d42 SHA-1: 8a288609bdc853c576e0811314d24c8fee5b78cb SHA-256: cebbd1408cade2a01e7a43ccf1f7b6166fe4ba05d48e4737d6ba1c41f6163570
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains multiple external URLs, some hosted on compromised CMS platforms. A critical heuristic indicates the document attempts to trick the user into copying and pasting content into a command-line context, suggesting an attempt to execute further malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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 https://coretry.ru/uplcv?utm_term=raspberry+pi+4+android+tv+10 PDF link annotation
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/megekidevejuz.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/81749419254.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/38953409137.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/zifutarijefarubukor.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/rixopivawazewijo.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/fisuvofepanorebibezugema.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/24739705054.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/r7j0fgr5cgpb6fdtaf04mhma9j/78949137685.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161300a12ce735---22724831569.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/19440373284.pdfIn PDF document text
    • http://dieukhactransam.com/uploads/files/89273187815.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/71725915611.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5cfdb5c5a---77627915614.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/vowalipudovedonedil.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/f9s5elk4d094thbgp7hj7il0ov/wudenuzitelukek.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/firevusewinenari.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/nuzadepimoma.pdfIn PDF document text
    • http://manu-transport.com/documents/file/rerafujovixunidexopa.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/babugaporup.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/52582804857.pdfIn PDF document text
    • http://keacg.com/upload/files/vozumuvakolibavezenam.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/8e8f56efc3c7a16988abef1d05832319/tafisideguzaxomoxuwux.pdfIn PDF document text
    • 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_off0000d29d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD29D 10956 bytes
SHA-256: bc8803722624269ee22fc23c067808a689a1ba52ba59f12e7b8ecdc5956cffe0
font_01_sfnt_off0000ec09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC09 18412 bytes
SHA-256: 5a63e9adc47f2ab36c2b27f4df148a9c6da8e45418d04d59881f3eb7b07e82e6
font_02_sfnt_off00011b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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